avcodec/huffyuvdec: Check vertical subsampling in hymt

Fixes: out of array access Fixes: 15484/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-5765377054736384 Fixes: 15559/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-5710295743332352 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>
6 years ago · 9ffa32b81b
parent 6aaa01afe4
commit 9ffa32b81b
1 changed files with 1 additions and 0 deletions
--- a/libavcodec/huffyuvdec.c
+++ b/libavcodec/huffyuvdec.c
@ -1252,6 +1252,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
        slice_height = AV_RL32(avpkt->data + buf_size - 8);
        nb_slices = AV_RL32(avpkt->data + buf_size - 12);
        if (nb_slices * 8LL + slices_info_offset > buf_size - 16 ||
+            s->chroma_v_shift ||
            slice_height <= 0 || nb_slices * (uint64_t)slice_height > height)
            return AVERROR_INVALIDDATA;
    } else {