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>

diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c
index 771481fd0329583ea7fade96f9a0fe370f5e3732..46dcfa823543c15f2a4569c57cda785d3531b205 100644 (file)
--- 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 {