avcodec/adpcm: Check channels before use for ADPCM_PSX

Fixes: division by zero Fixes: 26293/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_PSX_fuzzer-5176665237618688 Fixes: 26331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_PSX_fuzzer-5632330364092416 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
4 years ago · 4ebe40ef64
parent a4895b75a3
commit 4ebe40ef64
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@ -135,7 +135,7 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
        break;
    case AV_CODEC_ID_ADPCM_PSX:
        max_channels = 8;
-        if (avctx->block_align % (16 * avctx->channels))
+        if (avctx->channels <= 0 || avctx->block_align % (16 * avctx->channels))
            return AVERROR_INVALIDDATA;
        break;
    case AV_CODEC_ID_ADPCM_IMA_DAT4: