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avcodec/mpeg4videodec: Check mb_num also against 0

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The spec implies that 0 is invalid in addition to the existing checks

Found-by: <kierank>
Reviewed-by: Kieran Kunhya <kieran618@googlemail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 05f4703a168a336363750e32bcfdd6f303fbdbc3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-01-28 02:29:00 +01:00
parent ed06873b7b
commit 54a7d3efc4
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpeg4videodec.c
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@ -458,7 +458,7 @@ int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
}
mb_num = get_bits(&s->gb, mb_num_bits);
if (mb_num >= s->mb_num) {
if (mb_num >= s->mb_num || !mb_num) {
av_log(s->avctx, AV_LOG_ERROR,
"illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
return -1;