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avformat/wvdec: Check rate for overflow 

Fixes: signed integer overflow: 6000 * -2147483648 cannot be represented in type 'int'
Fixes: 25700/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6578316302352384

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 2020-09-20 20:53:31 +02:00
parent 1aee02c7c1
commit 688c1175ba
1 changed files with 3 additions and 2 deletions
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5
libavformat/wvdec.c
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@ -79,8 +79,9 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
{
WVContext *wc = ctx->priv_data;
int ret;
int rate, rate_x, bpp, chan;
int rate, bpp, chan;
uint32_t chmask, flags;
unsigned rate_x;
wc->pos = avio_tell(pb);
@ -192,7 +193,7 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
if (id & 0x40)
avio_skip(pb, 1);
}
if (rate == -1) {
if (rate == -1 || rate * (uint64_t)rate_x >= INT_MAX) {
av_log(ctx, AV_LOG_ERROR,
"Cannot determine custom sampling rate\n");
return AVERROR_INVALIDDATA;