From 4fa2d5a692f40c398a299acf2c6a20f5b98a3708 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 26 Dec 2019 00:57:07 +0100 Subject: [PATCH] avcodec/cbs_vp9: Check data_size Fixes: out of array access Fixes: 19542/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5659498341728256 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: James Almer 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 98730e03e3..ec82f11c76 100644 --- a/libavcodec/cbs_vp9.c +++ b/libavcodec/cbs_vp9.c @@ -416,6 +416,9 @@ static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx, uint8_t superframe_header; int err; + if (frag->data_size == 0) + return AVERROR_INVALIDDATA; + // Last byte in the packet. superframe_header = frag->data[frag->data_size - 1];