From fec6a5d940f7b792cf86ddaa38bf16926f873882 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 31 Jan 2021 14:59:27 +0100 Subject: [PATCH] avcodec/hevc_sei: Check payload size in decode_nal_sei_message() Fixes: out of array access Fixes: 29392/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-4821602850177024.fuzz Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 0791a515d38fd35c1e2a309ec8f4015153687b8c) Signed-off-by: Michael Niedermayer --- libavcodec/hevc_sei.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c index c59bd4321e..752ad59ddc 100644 --- a/libavcodec/hevc_sei.c +++ b/libavcodec/hevc_sei.c @@ -336,6 +336,8 @@ static int decode_nal_sei_message(GetBitContext *gb, void *logctx, HEVCSEI *s, byte = get_bits(gb, 8); payload_size += byte; } + if (get_bits_left(gb) < 8LL*payload_size) + return AVERROR_INVALIDDATA; if (nal_unit_type == HEVC_NAL_SEI_PREFIX) { return decode_nal_sei_prefix(gb, logctx, s, ps, payload_type, payload_size); } else { /* nal_unit_type == NAL_SEI_SUFFIX */