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avcodec/utils: Check ima wav duration for overflow

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Fixes: signed integer overflow: 44331634 * 65 cannot be represented in type 'int'
Fixes: 32120/clusterfuzz-testcase-minimized-ffmpeg_dem_RSD_fuzzer-5760221223583744

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 f40e9b1355)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-04-10 20:32:55 +02:00
parent f4c5abe2d0
commit 246b3d58a9
1 changed files with 5 additions and 1 deletions
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6
libavcodec/utils.c
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@ -773,11 +773,15 @@ static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba,
if (ba > 0) {
/* calc from frame_bytes, channels, and block_align */
int blocks = frame_bytes / ba;
int64_t tmp;
switch (id) {
case AV_CODEC_ID_ADPCM_IMA_WAV:
if (bps < 2 || bps > 5)
return 0;
return blocks * (1 + (ba - 4 * ch) / (bps * ch) * 8);
tmp = blocks * (1LL + (ba - 4 * ch) / (bps * ch) * 8);
if (tmp != (int)tmp)
return 0;
return tmp;
case AV_CODEC_ID_ADPCM_IMA_DK3:
return blocks * (((ba - 16) * 2 / 3 * 4) / ch);
case AV_CODEC_ID_ADPCM_IMA_DK4: