From 1f2096945709a32315da740691b5716da55893c3 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 16 Dec 2019 23:09:04 +0100 Subject: [PATCH] avcodec/agm: Include block size in the MV check for flags == 3 Fixes: out of array read Fixes: 19331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5644115983466496 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/agm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/agm.c b/libavcodec/agm.c index 628f324913..80f4697ee5 100644 --- a/libavcodec/agm.c +++ b/libavcodec/agm.c @@ -423,8 +423,8 @@ static int decode_inter_plane(AGMContext *s, GetBitContext *gb, int size, int map = s->map[x]; if (orig_mv_x >= -32) { - if (y * 8 + mv_y < 0 || y * 8 + mv_y >= h || - x * 8 + mv_x < 0 || x * 8 + mv_x >= w) + if (y * 8 + mv_y < 0 || y * 8 + mv_y + 8 >= h || + x * 8 + mv_x < 0 || x * 8 + mv_x + 8 >= w) return AVERROR_INVALIDDATA; copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,