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avformat/vividas: Check packet size 

Fixes: signed integer overflow: 119760682 - -2084600173 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_VIVIDAS_fuzzer-6745781167587328

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-09-18 19:14:07 +02:00
parent c5f61c99f9
commit 5f44489cc5
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1 changed files with 7 additions and 0 deletions
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7
libavformat/vividas.c
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@ -683,6 +683,7 @@ static int viv_read_packet(AVFormatContext *s,
if (viv->sb_entries[viv->current_sb_entry].flag == 0) {
uint64_t v_size = ffio_read_varlen(pb);
int last = 0, last_start;
if (!viv->num_audio)
return AVERROR_INVALIDDATA;
@ -706,12 +707,18 @@ static int viv_read_packet(AVFormatContext *s,
if (i > 0 && start == 0)
break;
if (start < last)
return AVERROR_INVALIDDATA;
viv->n_audio_subpackets = i + 1;
last =
viv->audio_subpackets[i].start = start;
viv->audio_subpackets[i].pcm_bytes = pcm_bytes;
}
last_start =
viv->audio_subpackets[viv->n_audio_subpackets].start = (int)(off - avio_tell(pb));
if (last_start < last)
return AVERROR_INVALIDDATA;
viv->current_audio_subpacket = 0;
} else {