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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-04-28 16:50:13 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-06-12 14:22:42 +0200 |
| commit | 3447979d08d701581a65f7275425cb1a59302319 (patch) | |
| tree | 75af9e9d81c6e3138369bf249229c2c6c3af5dd7 | |
| parent | dbbcfbcc4e4f0e91f814f2e13ced7b6d99069518 (diff) | |
| download | ffmpeg-3447979d08d701581a65f7275425cb1a59302319.tar.gz | |
avcodec/utils: do "calc from frame_bytes, channels, and block_align" in 64bit
Fixes: signed integer overflow: 104962766 * 32 cannot be represented in type 'int'
Fixes: 33614/clusterfuzz-testcase-minimized-ffmpeg_dem_RSD_fuzzer-6252129036664832
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/utils.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/libavcodec/utils.c b/libavcodec/utils.c index cc6796d8b6..342709353f 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -746,25 +746,33 @@ 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; + int64_t tmp = 0; switch (id) { case AV_CODEC_ID_ADPCM_IMA_WAV: if (bps < 2 || bps > 5) return 0; tmp = blocks * (1LL + (ba - 4 * ch) / (bps * ch) * 8); - if (tmp != (int)tmp) - return 0; - return tmp; + break; case AV_CODEC_ID_ADPCM_IMA_DK3: - return blocks * (((ba - 16) * 2 / 3 * 4) / ch); + tmp = blocks * (((ba - 16LL) * 2 / 3 * 4) / ch); + break; case AV_CODEC_ID_ADPCM_IMA_DK4: - return blocks * (1 + (ba - 4 * ch) * 2 / ch); + tmp = blocks * (1 + (ba - 4LL * ch) * 2 / ch); + break; case AV_CODEC_ID_ADPCM_IMA_RAD: - return blocks * ((ba - 4 * ch) * 2 / ch); + tmp = blocks * ((ba - 4LL * ch) * 2 / ch); + break; case AV_CODEC_ID_ADPCM_MS: - return blocks * (2 + (ba - 7 * ch) * 2LL / ch); + tmp = blocks * (2 + (ba - 7LL * ch) * 2LL / ch); + break; case AV_CODEC_ID_ADPCM_MTAF: - return blocks * (ba - 16) * 2 / ch; + tmp = blocks * (ba - 16LL) * 2 / ch; + break; + } + if (tmp) { + if (tmp != (int)tmp) + return 0; + return tmp; } } |