From d7fbabaeb558e4fe48a9a6b358cfc2962418959a Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 14 Dec 2019 00:27:09 +0100 Subject: [PATCH] avcodec/cbs_vp9: Check index_size Fixes: out of array read Fixes: 19300/clusterfuzz-testcase-minimized-ffmpeg_BSF_VP9_METADATA_fuzzer-5653911730126848 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: James Almer Signed-off-by: Michael Niedermayer (cherry picked from commit d6553e2e60a389296dd2f83a96f944ccfa5877a0) Signed-off-by: Michael Niedermayer --- libavcodec/cbs_vp9.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/cbs_vp9.c b/libavcodec/cbs_vp9.c index 5579d9b0af..80c9bac6e1 100644 --- a/libavcodec/cbs_vp9.c +++ b/libavcodec/cbs_vp9.c @@ -428,6 +428,9 @@ static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx, index_size = 2 + (((superframe_header & 0x18) >> 3) + 1) * ((superframe_header & 0x07) + 1); + if (index_size > frag->data_size) + return AVERROR_INVALIDDATA; + err = init_get_bits(&gbc, frag->data + frag->data_size - index_size, 8 * index_size); if (err < 0)