From 8ed2948348673407c5e30662687ff445fc621c52 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 11 Jan 2023 18:59:16 +0100 Subject: avcodec/utils: allocate a line more for VC1 and WMV3 Fixes: out of array read on 32bit Fixes: 54857/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5840588224462848 The chroma MC code reads over the currently allocated frame. Alternative fixes would be allocating a few bytes more at the end instead of a whole line extra or to adjust the threshold where the edge emu code is activated Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 01636a63d452c592ece35af6f72bb7affcad58f2) Signed-off-by: Michael Niedermayer --- libavcodec/utils.c | 1 + 1 file changed, 1 insertion(+) diff --git a/libavcodec/utils.c b/libavcodec/utils.c index 073ad20c62..97110fe70d 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -318,6 +318,7 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, *width = FFALIGN(*width, w_align); *height = FFALIGN(*height, h_align); if (s->codec_id == AV_CODEC_ID_H264 || s->lowres || + s->codec_id == AV_CODEC_ID_VC1 || s->codec_id == AV_CODEC_ID_WMV3 || s->codec_id == AV_CODEC_ID_VP5 || s->codec_id == AV_CODEC_ID_VP6 || s->codec_id == AV_CODEC_ID_VP6F || s->codec_id == AV_CODEC_ID_VP6A ) { -- cgit v1.2.1