[FFmpeg-cvslog] movdec: Try to recover from overreading atoms

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed Aug 15 03:21:19 2012 +0200| [6093960ae35c8d69c559b5604f683c2ea3f279ca] | committer: Michael Niedermayer

movdec: Try to recover from overreading atoms

Fixes Ticket1596

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6093960ae35c8d69c559b5604f683c2ea3f279ca
---

 libavformat/mov.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index dce2c91..cb8307f 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2666,6 +2666,10 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
             left = a.size - avio_tell(pb) + start_pos;
             if (left > 0) /* skip garbage at atom end */
                 avio_skip(pb, left);
+            else if(left < 0) {
+                av_log(c->fc, AV_LOG_DEBUG, "undoing overread of %d in '%.4s'\n", -left, (char*)&a.type);
+                avio_seek(pb, left, SEEK_CUR);
+            }
         }
 
         total_size += a.size;