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return error if frame_offset is negative, prevent segfault

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Originally committed as revision 13420 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-05-26 03:53:48 +00:00
parent e5ece1831a
commit eea2f032ad
1 changed files with 1 additions and 1 deletions
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libavformat/ffmdec.c
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@ -104,7 +104,7 @@ static int ffm_read_data(AVFormatContext *s,
frame_offset = get_be16(pb);
get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
if (ffm->packet_end < ffm->packet)
if (ffm->packet_end < ffm->packet || frame_offset < 0)
return -1;
/* if first packet or resynchronization packet, we must
handle it specifically */