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avformat/vividas: Fix n_sb_blocks Check 

Fixes: signed integer overflow: 1540265776 * 2 cannot be represented in type 'int'
Fixes: 18160/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5758808818712576

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 114ddf6430)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-14 23:17:51 +02:00
parent 1c1b94aaae
commit c609312a47
1 changed files with 1 additions and 1 deletions
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2
libavformat/vividas.c
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@ -438,7 +438,7 @@ static int track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *bu
ffio_read_varlen(pb); // track_index_len
avio_r8(pb); // 'c'
viv->n_sb_blocks = ffio_read_varlen(pb);
if (viv->n_sb_blocks * 2 > size)
if (viv->n_sb_blocks < 0 || viv->n_sb_blocks > size / 2)
goto error;
viv->sb_blocks = av_calloc(viv->n_sb_blocks, sizeof(VIV_SB_block));
if (!viv->sb_blocks) {