idevicebackup4: don't segfault if opening file for writing fails

1 files changed, 7 insertions, 4 deletions

diff --git a/tools/idevicebackup4.c b/tools/idevicebackup4.c
index c4ee847..ef3fdd0 100644
--- a/tools/idevicebackup4.c
+++ b/tools/idevicebackup4.c
@@ -1056,7 +1056,7 @@ static int handle_receive_files(plist_t message, const char *backup_dir)
 
                 remove(bname);
                 f = fopen(bname, "wb");
-                while (code == CODE_FILE_DATA) {
+                while (f && (code == CODE_FILE_DATA)) {
                         blocksize = nlen-1;
                         bdone = 0;
                         rlen = 0;
@@ -1090,9 +1090,12 @@ static int handle_receive_files(plist_t message, const char *backup_dir)
                                 break;
                         }
                 }
-                fclose(f);
-
-                file_count++;
+                if (f) {
+                        fclose(f);
+                        file_count++;
+                } else {
+                        printf("Error opening '%s' for writing: %s\n", bname, strerror(errno));
+                }
                 if (backup_total_size > 0)
                         print_progress(backup_real_size, backup_total_size);
                 if (nlen == 0) {