From: Thiago Santos <thiagoss@osg.samsung.com>
Date: Fri, 19 Feb 2016 19:40:54 +0000 (-0300)
Subject: mpeg4parser: prevent assertion when scanning for sync code
X-Git-Tag: 1.19.3~507^2~6963
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=115945b66366a875f9d848d8f463a9406a1bd514;p=platform%2Fupstream%2Fgstreamer.git

mpeg4parser: prevent assertion when scanning for sync code

Only search if there is indeed enough data to be searched otherwise
an assertion is raised
---

diff --git a/gst-libs/gst/codecparsers/gstmpeg4parser.c b/gst-libs/gst/codecparsers/gstmpeg4parser.c
index ce156c5a28..b23fc872fa 100644
--- a/gst-libs/gst/codecparsers/gstmpeg4parser.c
+++ b/gst-libs/gst/codecparsers/gstmpeg4parser.c
@@ -481,8 +481,11 @@ gst_mpeg4_parse (GstMpeg4Packet * packet, gboolean skip_user_data,
   packet->type = (GstMpeg4StartCode) (data[off1 + 3]);
 
 find_end:
-  off2 = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100,
-      off1 + 4, size - off1 - 4);
+  if (off1 < size - 4)
+    off2 = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100,
+        off1 + 4, size - off1 - 4);
+  else
+    off2 = -1;
 
   if (off2 == -1) {
     GST_DEBUG ("Packet start %d, No end found", off1 + 4);