From 4222bc1b880d6535462e3b5ba5431809a3c5fddc Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Thu, 14 Mar 2013 03:09:14 +0100
Subject: global: make sure to check service before checking service->port to
 prevent crashes

---
 dev/afccheck.c                  |  2 +-
 dev/ideviceclient.c             | 17 +++++------------
 src/afc.c                       |  2 +-
 src/device_link_service.c       |  2 +-
 src/diagnostics_relay.c         |  2 +-
 src/file_relay.c                |  2 +-
 src/heartbeat.c                 |  6 +++---
 src/house_arrest.c              |  3 ---
 src/installation_proxy.c        |  8 +++-----
 src/misagent.c                  |  3 ---
 src/mobile_image_mounter.c      |  8 +++-----
 src/mobilebackup.c              |  5 ++---
 src/mobilebackup2.c             |  2 +-
 src/mobilesync.c                |  2 +-
 src/notification_proxy.c        |  8 +++-----
 src/property_list_service.c     |  2 +-
 src/sbservices.c                |  3 ---
 src/screenshotr.c               |  2 +-
 src/service.c                   |  4 ++--
 src/webinspector.c              |  6 +++---
 tools/idevicebackup.c           | 11 +++--------
 tools/idevicebackup2.c          | 11 +++--------
 tools/idevicedebugserverproxy.c |  2 +-
 tools/idevicediagnostics.c      |  2 +-
 tools/ideviceimagemounter.c     |  4 ++--
 tools/idevicescreenshot.c       |  2 +-
 26 files changed, 44 insertions(+), 77 deletions(-)

diff --git a/dev/afccheck.c b/dev/afccheck.c
index ead0ca0..d7ee7d1 100644
--- a/dev/afccheck.c
+++ b/dev/afccheck.c
@@ -111,7 +111,7 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
-	if (LOCKDOWN_E_SUCCESS == lockdownd_start_service(client, "com.apple.afc", &service) && !service->port) {
+	if (LOCKDOWN_E_SUCCESS != lockdownd_start_service(client, "com.apple.afc", &service) || !service || !service->port) {
 		lockdownd_client_free(client);
 		idevice_free(phone);
 		fprintf(stderr, "Something went wrong when starting AFC.");
diff --git a/dev/ideviceclient.c b/dev/ideviceclient.c
index c8635d8..778f20e 100644
--- a/dev/ideviceclient.c
+++ b/dev/ideviceclient.c
@@ -49,7 +49,7 @@ static void perform_notification(idevice_t phone, lockdownd_client_t client, con
 	np_client_t np;
 
 	lockdownd_start_service(client, "com.apple.mobile.notification_proxy", &service);
-	if (service->port) {
+	if (service && service->port) {
 		printf("::::::::::::::: np was started ::::::::::::\n");
 		np_client_new(phone, service, &np);
 		if (np) {
@@ -109,15 +109,10 @@ int main(int argc, char *argv[])
 
 	lockdownd_start_service(client, "com.apple.afc", &service);
 
-	if (service->port) {
+	if (service && service->port) {
 		afc_client_t afc = NULL;
 		afc_client_new(phone, service, &afc);
 
-		if (service) {
-			lockdownd_service_descriptor_free(service);
-			service = NULL;
-		}
-
 		if (afc) {
 			service->port = 0;
 			service->ssl_enabled = 0;
@@ -129,11 +124,6 @@ int main(int argc, char *argv[])
 				printf("ERROR: Notification proxy could not be started.\n");
 			}
 
-			if (service) {
-				lockdownd_service_descriptor_free(service);
-				service = NULL;
-			}
-
 			if (gnp) {
 				const char *nspec[5] = {
 					NP_SYNC_CANCEL_REQUEST,
@@ -266,6 +256,9 @@ int main(int argc, char *argv[])
 		}
 
 		afc_client_free(afc);
+
+		lockdownd_service_descriptor_free(service);
+		service = NULL;
 	} else {
 		printf("Start service failure.\n");
 	}
diff --git a/src/afc.c b/src/afc.c
index d61032d..c281e2c 100644
--- a/src/afc.c
+++ b/src/afc.c
@@ -123,7 +123,7 @@ afc_error_t afc_client_new_with_service_client(service_client_t service_client,
  */
 afc_error_t afc_client_new(idevice_t device, lockdownd_service_descriptor_t service, afc_client_t * client)
 {
-	if (!device || service->port == 0)
+	if (!device || !service || service->port == 0)
 		return AFC_E_INVALID_ARG;
 
 	service_client_t parent = NULL;
diff --git a/src/device_link_service.c b/src/device_link_service.c
index ac89211..2608b9f 100644
--- a/src/device_link_service.c
+++ b/src/device_link_service.c
@@ -84,7 +84,7 @@ static int device_link_service_get_message(plist_t dl_msg, char **message)
  */
 device_link_service_error_t device_link_service_client_new(idevice_t device, lockdownd_service_descriptor_t service, device_link_service_client_t *client)
 {
-	if (!device || service->port == 0 || !client || *client) {
+	if (!device || !service || service->port == 0 || !client || *client) {
 		return DEVICE_LINK_SERVICE_E_INVALID_ARG;
 	}
 
diff --git a/src/diagnostics_relay.c b/src/diagnostics_relay.c
index 3469ae4..506b901 100644
--- a/src/diagnostics_relay.c
+++ b/src/diagnostics_relay.c
@@ -83,7 +83,7 @@ static int diagnostics_relay_check_result(plist_t dict)
  */
 diagnostics_relay_error_t diagnostics_relay_client_new(idevice_t device, lockdownd_service_descriptor_t service, diagnostics_relay_client_t *client)
 {
-	if (!device || service->port == 0 || !client || *client) {
+	if (!device || !service || service->port == 0 || !client || *client) {
 		return DIAGNOSTICS_RELAY_E_INVALID_ARG;
 	}
 
diff --git a/src/file_relay.c b/src/file_relay.c
index 39382fb..b1adb4f 100644
--- a/src/file_relay.c
+++ b/src/file_relay.c
@@ -38,7 +38,7 @@
  */
 file_relay_error_t file_relay_client_new(idevice_t device, lockdownd_service_descriptor_t service, file_relay_client_t *client)
 {
-	if (!device || service->port == 0 || !client || *client) {
+	if (!device || !service || service->port == 0 || !client || *client) {
 		return FILE_RELAY_E_INVALID_ARG;
 	}
 
diff --git a/src/heartbeat.c b/src/heartbeat.c
index 0f8d2f3..cee852e 100644
--- a/src/heartbeat.c
+++ b/src/heartbeat.c
@@ -74,13 +74,13 @@ heartbeat_error_t heartbeat_client_new(idevice_t device, lockdownd_service_descr
 {
 	*client = NULL;
 
-	debug_info("Creating heartbeat_client, port = %d.", service->port);
-
-	if (!device || service->port == 0 || !client || *client) {
+	if (!device || !service || service->port == 0 || !client || *client) {
 		debug_info("Incorrect parameter passed to heartbeat_client_new.");
 		return HEARTBEAT_E_INVALID_ARG;
 	}
 
+	debug_info("Creating heartbeat_client, port = %d.", service->port);
+
 	property_list_service_client_t plclient = NULL;
 	heartbeat_error_t ret = heartbeat_error(property_list_service_client_new(device, service, &plclient));
 	if (ret != HEARTBEAT_E_SUCCESS) {
diff --git a/src/house_arrest.c b/src/house_arrest.c
index b3dbbf8..5dfd1b6 100644
--- a/src/house_arrest.c
+++ b/src/house_arrest.c
@@ -68,9 +68,6 @@ static house_arrest_error_t house_arrest_error(property_list_service_error_t err
  */
 house_arrest_error_t house_arrest_client_new(idevice_t device, lockdownd_service_descriptor_t service, house_arrest_client_t *client)
 {
-	if (!device)
-		return HOUSE_ARREST_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
 	house_arrest_error_t err = house_arrest_error(property_list_service_client_new(device, service, &plistclient));
 	if (err != HOUSE_ARREST_E_SUCCESS) {
diff --git a/src/installation_proxy.c b/src/installation_proxy.c
index eacab9d..d4c1750 100644
--- a/src/installation_proxy.c
+++ b/src/installation_proxy.c
@@ -104,12 +104,10 @@ static instproxy_error_t instproxy_error(property_list_service_error_t err)
  */
 instproxy_error_t instproxy_client_new(idevice_t device, lockdownd_service_descriptor_t service, instproxy_client_t *client)
 {
-	if (!device)
-		return INSTPROXY_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
-	if (property_list_service_client_new(device, service, &plistclient) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
-		return INSTPROXY_E_CONN_FAILED;
+	instproxy_error_t err = instproxy_error(property_list_service_client_new(device, service, &plistclient));
+	if (err != INSTPROXY_E_SUCCESS) {
+		return err;
 	}
 
 	instproxy_client_t client_loc = (instproxy_client_t) malloc(sizeof(struct instproxy_client_private));
diff --git a/src/misagent.c b/src/misagent.c
index cb84188..1bc4519 100644
--- a/src/misagent.c
+++ b/src/misagent.c
@@ -100,9 +100,6 @@ static misagent_error_t misagent_check_result(plist_t response, int* status_code
  */
 misagent_error_t misagent_client_new(idevice_t device, lockdownd_service_descriptor_t service, misagent_client_t *client)
 {
-	if (!device)
-		return MISAGENT_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
 	misagent_error_t err = misagent_error(property_list_service_client_new(device, service, &plistclient));
 	if (err != MISAGENT_E_SUCCESS) {
diff --git a/src/mobile_image_mounter.c b/src/mobile_image_mounter.c
index 3e31ef4..1d608db 100644
--- a/src/mobile_image_mounter.c
+++ b/src/mobile_image_mounter.c
@@ -98,12 +98,10 @@ static mobile_image_mounter_error_t mobile_image_mounter_error(property_list_ser
  */
 mobile_image_mounter_error_t mobile_image_mounter_new(idevice_t device, lockdownd_service_descriptor_t service, mobile_image_mounter_client_t *client)
 {
-	if (!device)
-		return MOBILE_IMAGE_MOUNTER_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
-	if (property_list_service_client_new(device, service, &plistclient) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
-		return MOBILE_IMAGE_MOUNTER_E_CONN_FAILED;
+	mobile_image_mounter_error_t err = mobile_image_mounter_error(property_list_service_client_new(device, service, &plistclient));
+	if (err != MOBILE_IMAGE_MOUNTER_E_SUCCESS) {
+		return err;
 	}
 
 	mobile_image_mounter_client_t client_loc = (mobile_image_mounter_client_t) malloc(sizeof(struct mobile_image_mounter_client_private));
diff --git a/src/mobilebackup.c b/src/mobilebackup.c
index ab4dec0..aae4b06 100644
--- a/src/mobilebackup.c
+++ b/src/mobilebackup.c
@@ -72,10 +72,9 @@ static mobilebackup_error_t mobilebackup_error(device_link_service_error_t err)
  *     or more parameters are invalid, or DEVICE_LINK_SERVICE_E_BAD_VERSION if
  *     the mobilebackup version on the device is newer.
  */
-mobilebackup_error_t mobilebackup_client_new(idevice_t device, lockdownd_service_descriptor_t service,
-						   mobilebackup_client_t * client)
+mobilebackup_error_t mobilebackup_client_new(idevice_t device, lockdownd_service_descriptor_t service, mobilebackup_client_t * client)
 {
-	if (!device || service->port == 0 || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return MOBILEBACKUP_E_INVALID_ARG;
 
 	device_link_service_client_t dlclient = NULL;
diff --git a/src/mobilebackup2.c b/src/mobilebackup2.c
index 15ba469..6356376 100644
--- a/src/mobilebackup2.c
+++ b/src/mobilebackup2.c
@@ -76,7 +76,7 @@ static mobilebackup2_error_t mobilebackup2_error(device_link_service_error_t err
 mobilebackup2_error_t mobilebackup2_client_new(idevice_t device, lockdownd_service_descriptor_t service,
 						mobilebackup2_client_t * client)
 {
-	if (!device || service->port == 0 || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return MOBILEBACKUP2_E_INVALID_ARG;
 
 	device_link_service_client_t dlclient = NULL;
diff --git a/src/mobilesync.c b/src/mobilesync.c
index 4fe24b2..af70ea4 100644
--- a/src/mobilesync.c
+++ b/src/mobilesync.c
@@ -81,7 +81,7 @@ static mobilesync_error_t mobilesync_error(device_link_service_error_t err)
 mobilesync_error_t mobilesync_client_new(idevice_t device, lockdownd_service_descriptor_t service,
 						   mobilesync_client_t * client)
 {
-	if (!device || service->port == 0 || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return MOBILESYNC_E_INVALID_ARG;
 
 	device_link_service_client_t dlclient = NULL;
diff --git a/src/notification_proxy.c b/src/notification_proxy.c
index 8fb9ad0..5b293f8 100644
--- a/src/notification_proxy.c
+++ b/src/notification_proxy.c
@@ -108,12 +108,10 @@ static np_error_t np_error(property_list_service_error_t err)
  */
 np_error_t np_client_new(idevice_t device, lockdownd_service_descriptor_t service, np_client_t *client)
 {
-	if (!device)
-		return NP_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
-	if (property_list_service_client_new(device, service, &plistclient) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
-		return NP_E_CONN_FAILED;
+	np_error_t err = np_error(property_list_service_client_new(device, service, &plistclient));
+	if (err != NP_E_SUCCESS) {
+		return err;
 	}
 
 	np_client_t client_loc = (np_client_t) malloc(sizeof(struct np_client_private));
diff --git a/src/property_list_service.c b/src/property_list_service.c
index 025a9bc..941f37e 100644
--- a/src/property_list_service.c
+++ b/src/property_list_service.c
@@ -68,7 +68,7 @@ static property_list_service_error_t service_to_property_list_service_error(serv
  */
 property_list_service_error_t property_list_service_client_new(idevice_t device, lockdownd_service_descriptor_t service, property_list_service_client_t *client)
 {
-	if (!device || (service->port == 0) || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return PROPERTY_LIST_SERVICE_E_INVALID_ARG;
 
 	service_client_t parent = NULL;
diff --git a/src/sbservices.c b/src/sbservices.c
index 6b1a4d1..00f2862 100644
--- a/src/sbservices.c
+++ b/src/sbservices.c
@@ -97,9 +97,6 @@ static sbservices_error_t sbservices_error(property_list_service_error_t err)
  */
 sbservices_error_t sbservices_client_new(idevice_t device, lockdownd_service_descriptor_t service, sbservices_client_t *client)
 {
-	if (!device)
-		return SBSERVICES_E_INVALID_ARG;
-
 	property_list_service_client_t plistclient = NULL;
 	sbservices_error_t err = sbservices_error(property_list_service_client_new(device, service, &plistclient));
 	if (err != SBSERVICES_E_SUCCESS) {
diff --git a/src/screenshotr.c b/src/screenshotr.c
index e2bc979..b538232 100644
--- a/src/screenshotr.c
+++ b/src/screenshotr.c
@@ -76,7 +76,7 @@ static screenshotr_error_t screenshotr_error(device_link_service_error_t err)
 screenshotr_error_t screenshotr_client_new(idevice_t device, lockdownd_service_descriptor_t service,
 					   screenshotr_client_t * client)
 {
-	if (!device || service->port == 0 || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return SCREENSHOTR_E_INVALID_ARG;
 
 	device_link_service_client_t dlclient = NULL;
diff --git a/src/service.c b/src/service.c
index 959c9fb..abd1696 100644
--- a/src/service.c
+++ b/src/service.c
@@ -66,7 +66,7 @@ static service_error_t idevice_to_service_error(idevice_error_t err)
  */
 service_error_t service_client_new(idevice_t device, lockdownd_service_descriptor_t service, service_client_t *client)
 {
-	if (!device || (service->port == 0) || !client || *client)
+	if (!device || !service || service->port == 0 || !client || *client)
 		return SERVICE_E_INVALID_ARG;
 
 	/* Attempt connection */
@@ -117,7 +117,7 @@ service_error_t service_client_factory_start_service(idevice_t device, const cha
 	lockdownd_start_service(lckd, service_name, &service);
 	lockdownd_client_free(lckd);
 
-	if (service->port <= 0) {
+	if (!service || service->port == 0) {
 		debug_info("Could not start service %s!", service_name);
 		return SERVICE_E_START_SERVICE_ERROR;
 	}
diff --git a/src/webinspector.c b/src/webinspector.c
index fea26d4..aef6d6f 100644
--- a/src/webinspector.c
+++ b/src/webinspector.c
@@ -74,13 +74,13 @@ webinspector_error_t webinspector_client_new(idevice_t device, lockdownd_service
 {
 	*client = NULL;
 
-	debug_info("Creating webinspector_client, port = %d.", service->port);
-
-	if (!device || service->port == 0 || !client || *client) {
+	if (!device || !service || service->port == 0 || !client || *client) {
 		debug_info("Incorrect parameter passed to webinspector_client_new.");
 		return WEBINSPECTOR_E_INVALID_ARG;
 	}
 
+	debug_info("Creating webinspector_client, port = %d.", service->port);
+
 	property_list_service_client_t plclient = NULL;
 	webinspector_error_t ret = webinspector_error(property_list_service_client_new(device, service, &plclient));
 	if (ret != WEBINSPECTOR_E_SUCCESS) {
diff --git a/tools/idevicebackup.c b/tools/idevicebackup.c
index 95c5694..8f5362c 100644
--- a/tools/idevicebackup.c
+++ b/tools/idevicebackup.c
@@ -755,7 +755,7 @@ static void do_post_notification(const char *notification)
 	}
 
 	lockdownd_start_service(client, NP_SERVICE_NAME, &service);
-	if (service->port) {
+	if (service && service->port) {
 		np_client_new(device, service, &np);
 		if (np) {
 			np_post_notification(np, notification);
@@ -937,7 +937,7 @@ int main(int argc, char *argv[])
 	/* start notification_proxy */
 	np_client_t np = NULL;
 	ret = lockdownd_start_service(client, NP_SERVICE_NAME, &service);
-	if ((ret == LOCKDOWN_E_SUCCESS) && service->port) {
+	if ((ret == LOCKDOWN_E_SUCCESS) && service && service->port) {
 		np_client_new(device, service, &np);
 		np_set_notify_callback(np, notify_cb, NULL);
 		const char *noties[5] = {
@@ -952,11 +952,6 @@ int main(int argc, char *argv[])
 		printf("ERROR: Could not start service %s.\n", NP_SERVICE_NAME);
 	}
 
-	if (service) {
-		lockdownd_service_descriptor_free(service);
-		service = NULL;
-	}
-
 	afc_client_t afc = NULL;
 	if (cmd == CMD_BACKUP) {
 		/* start AFC, we need this for the lock file */
@@ -975,7 +970,7 @@ int main(int argc, char *argv[])
 
 	/* start mobilebackup service and retrieve port */
 	ret = lockdownd_start_service(client, MOBILEBACKUP_SERVICE_NAME, &service);
-	if ((ret == LOCKDOWN_E_SUCCESS) && service->port) {
+	if ((ret == LOCKDOWN_E_SUCCESS) && service && service->port) {
 		printf("Started \"%s\" service on port %d.\n", MOBILEBACKUP_SERVICE_NAME, service->port);
 		mobilebackup_client_new(device, service, &mobilebackup);
 
diff --git a/tools/idevicebackup2.c b/tools/idevicebackup2.c
index 0353c9b..d70a7ae 100644
--- a/tools/idevicebackup2.c
+++ b/tools/idevicebackup2.c
@@ -489,7 +489,7 @@ static void do_post_notification(idevice_t device, const char *notification)
 	}
 
 	lockdownd_start_service(lockdown, NP_SERVICE_NAME, &service);
-	if (service->port) {
+	if (service && service->port) {
 		np_client_new(device, service, &np);
 		if (np) {
 			np_post_notification(np, notification);
@@ -1557,7 +1557,7 @@ int main(int argc, char *argv[])
 	/* start notification_proxy */
 	np_client_t np = NULL;
 	ret = lockdownd_start_service(lockdown, NP_SERVICE_NAME, &service);
-	if ((ret == LOCKDOWN_E_SUCCESS) && service->port) {
+	if ((ret == LOCKDOWN_E_SUCCESS) && service && service->port) {
 		np_client_new(device, service, &np);
 		np_set_notify_callback(np, notify_cb, NULL);
 		const char *noties[5] = {
@@ -1572,11 +1572,6 @@ int main(int argc, char *argv[])
 		printf("ERROR: Could not start service %s.\n", NP_SERVICE_NAME);
 	}
 
-	if (service) {
-		lockdownd_service_descriptor_free(service);
-		service = NULL;
-	}
-
 	afc_client_t afc = NULL;
 	if (cmd == CMD_BACKUP) {
 		/* start AFC, we need this for the lock file */
@@ -1596,7 +1591,7 @@ int main(int argc, char *argv[])
 	/* start mobilebackup service and retrieve port */
 	mobilebackup2_client_t mobilebackup2 = NULL;
 	ret = lockdownd_start_service(lockdown, MOBILEBACKUP2_SERVICE_NAME, &service);
-	if ((ret == LOCKDOWN_E_SUCCESS) && service->port) {
+	if ((ret == LOCKDOWN_E_SUCCESS) && service && service->port) {
 		PRINT_VERBOSE(1, "Started \"%s\" service on port %d.\n", MOBILEBACKUP2_SERVICE_NAME, service->port);
 		mobilebackup2_client_new(device, service, &mobilebackup2);
 
diff --git a/tools/idevicedebugserverproxy.c b/tools/idevicedebugserverproxy.c
index 32438ad..3a25ebc 100644
--- a/tools/idevicedebugserverproxy.c
+++ b/tools/idevicedebugserverproxy.c
@@ -297,7 +297,7 @@ int main(int argc, char *argv[])
 		goto leave_cleanup;
 	}
 
-	if ((lockdownd_start_service(lockdown, "com.apple.debugserver", &service) != LOCKDOWN_E_SUCCESS) || !service->port) {
+	if ((lockdownd_start_service(lockdown, "com.apple.debugserver", &service) != LOCKDOWN_E_SUCCESS) || !service || !service->port) {
 		fprintf(stderr, "Could not start com.apple.debugserver!\nPlease make sure to mount the developer disk image first.\n");
 		result = EXIT_FAILURE;
 		goto leave_cleanup;
diff --git a/tools/idevicediagnostics.c b/tools/idevicediagnostics.c
index 410d054..464df20 100644
--- a/tools/idevicediagnostics.c
+++ b/tools/idevicediagnostics.c
@@ -188,7 +188,7 @@ int main(int argc, char **argv)
 
 	lockdownd_client_free(lockdown_client);
 
-	if ((ret == LOCKDOWN_E_SUCCESS) && (service->port > 0)) {
+	if ((ret == LOCKDOWN_E_SUCCESS) && service && (service->port > 0)) {
 		if (diagnostics_relay_client_new(device, service, &diagnostics_client) != DIAGNOSTICS_RELAY_E_SUCCESS) {
 			printf("Could not connect to diagnostics_relay!\n");
 			result = -1;
diff --git a/tools/ideviceimagemounter.c b/tools/ideviceimagemounter.c
index 57a2e27..e57d83a 100644
--- a/tools/ideviceimagemounter.c
+++ b/tools/ideviceimagemounter.c
@@ -305,7 +305,7 @@ int main(int argc, char **argv)
 
 	lockdownd_start_service(lckd, "com.apple.mobile.mobile_image_mounter", &service);
 
-	if (service->port == 0) {
+	if (!service || service->port == 0) {
 		printf("ERROR: Could not start mobile_image_mounter service!\n");
 		goto leave;
 	}
@@ -323,7 +323,7 @@ int main(int argc, char **argv)
 	if (!list_mode) {
 		struct stat fst;
 		if ((lockdownd_start_service(lckd, "com.apple.afc", &service) !=
-			 LOCKDOWN_E_SUCCESS) || !service->port) {
+			 LOCKDOWN_E_SUCCESS) || !service || !service->port) {
 			fprintf(stderr, "Could not start com.apple.afc!\n");
 			goto leave;
 		}
diff --git a/tools/idevicescreenshot.c b/tools/idevicescreenshot.c
index 23e7b41..d056dd0 100644
--- a/tools/idevicescreenshot.c
+++ b/tools/idevicescreenshot.c
@@ -83,7 +83,7 @@ int main(int argc, char **argv)
 
 	lockdownd_start_service(lckd, "com.apple.mobile.screenshotr", &service);
 	lockdownd_client_free(lckd);
-	if (service->port > 0) {
+	if (service && service->port > 0) {
 		if (screenshotr_client_new(device, service, &shotr) != SCREENSHOTR_E_SUCCESS) {
 			printf("Could not connect to screenshotr!\n");
 		} else {
-- 
cgit v1.1-32-gdbae