Revise several changes from commit 245bc9b6510a8900c69c2fd543434bae1bc6ca6a

In very rare cases the changes introduced by commit can actually cause
an invalid free. Reverted those changes. Also, plist_free() will check
for NULL before doing anything, so an extra check for that is not needed.

2 files changed, 10 insertions, 11 deletions

diff --git a/src/recovery.c b/src/recovery.c
index c21af19..907b1f2 100644
--- a/src/recovery.c
+++ b/src/recovery.c
@@ -168,13 +168,17 @@ int recovery_enter_restore(struct idevicerestore_client_t* client, plist_t build
 	char* value = NULL;
 	irecv_getenv(client->recovery->client, "build-version", &value);
 	info("iBoot build-version=%s\n", (value) ? value : "(unknown)");
-	free(value);
-	value = NULL;
+	if (value) {
+		free(value);
+		value = NULL;
+	}
 
 	irecv_getenv(client->recovery->client, "build-style", &value);
 	info("iBoot build-style=%s\n", (value) ? value : "(unknown)");
-	free(value);
-	value = NULL;
+	if (value) {
+		free(value);
+		value = NULL;
+	}
 
 	unsigned long radio_error = 0;
 	irecv_getenv(client->recovery->client, "radio-error", &value);
@@ -269,7 +273,6 @@ int recovery_send_component(struct idevicerestore_client_t* client, plist_t buil
 	if (!path) {
 		if (build_identity_get_component_path(build_identity, component, &path) < 0) {
 			error("ERROR: Unable to get path for component '%s'\n", component);
-			free(path);
 			return -1;
 		}
 	}
diff --git a/src/restore.c b/src/restore.c
index 3abf082..c81a7e4 100644
--- a/src/restore.c
+++ b/src/restore.c
@@ -779,7 +779,6 @@ int restore_send_kernelcache(restored_client_t restore, struct idevicerestore_cl
 	if (!path) {
 		if (build_identity_get_component_path(build_identity, "KernelCache", &path) < 0) {
 			error("ERROR: Unable to find kernelcache path\n");
-			free(path);
 			return -1;
 		}
 	}
@@ -848,7 +847,6 @@ int restore_send_nor(restored_client_t restore, struct idevicerestore_client_t*
 	if (llb_path == NULL) {
 		if (build_identity_get_component_path(build_identity, "LLB", &llb_path) < 0) {
 			error("ERROR: Unable to get component path for LLB\n");
-			free(llb_path);
 			return -1;
 		}
 	}
@@ -1913,10 +1911,8 @@ int restore_device(struct idevicerestore_client_t* client, plist_t build_identit
 		}
 
 		free(type);
-		if (message) {
-			plist_free(message);
-			message = NULL;
-		}
+		plist_free(message);
+		message = NULL;
 	}
 
 	restore_client_free(client);