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avcodec/dirac_parser: Fix overflow in dts

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Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'
Fixes: 15568/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5634719611355136

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-11 23:23:07 +02:00
parent 3c06ba1716
commit 549fcba8fc
1 changed files with 1 additions and 1 deletions
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libavcodec/dirac_parser.c
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@ -212,7 +212,7 @@ static int dirac_combine_frame(AVCodecParserContext *s, AVCodecContext *avctx,
if (parse_timing_info && pu1.prev_pu_offset >= 13) {
uint8_t *cur_pu = pc->buffer +
pc->index - 13 - pu1.prev_pu_offset;
int pts = AV_RB32(cur_pu + 13);
int64_t pts = AV_RB32(cur_pu + 13);
if (s->last_pts == 0 && s->last_dts == 0)
s->dts = pts - 1;
else