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avcodec/movtextdec: Fix tsmb_size check==0 check

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Fixes: 173/fuzz-3-ffmpeg_SUBTITLE_AV_CODEC_ID_MOV_TEXT_fuzzer

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-11-15 14:52:21 +01:00
parent 6ea2715768
commit a609905723
1 changed files with 4 additions and 4 deletions
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8
libavcodec/movtextdec.c
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@ -471,10 +471,6 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
tsmb_type = AV_RB32(tsmb);
tsmb += 4;
if (tsmb_size == 0) {
return AVERROR_INVALIDDATA;
}
if (tsmb_size == 1) {
if (m->tracksize + 16 > avpkt->size)
break;
@ -485,6 +481,10 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
m->size_var = 8;
//size_var is equal to 8 or 16 depending on the size of box
if (tsmb_size == 0) {
return AVERROR_INVALIDDATA;
}
if (tsmb_size > avpkt->size - m->tracksize)
break;