Don't crash when the user specifies audio tracks that don't exist from the HandBrakeCLI

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@1640 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 7 insertions, 2 deletions

diff --git a/libhb/common.c b/libhb/common.c
index c8cc8dddc..f0ad9e4a2 100644
--- a/libhb/common.c
+++ b/libhb/common.c
@@ -667,8 +667,13 @@ void hb_filter_close( hb_filter_object_t ** _f )
  *********************************************************************/
 hb_audio_t *hb_audio_copy(const hb_audio_t *src)
 {
-    hb_audio_t *audio = calloc(1, sizeof(*audio));
-    memcpy(audio, src, sizeof(*audio));
+    hb_audio_t *audio = NULL;
+
+    if( src )
+    {
+        audio = calloc(1, sizeof(*audio));
+        memcpy(audio, src, sizeof(*audio));
+    }
     return audio;
 }