From 98b350405969997db561c4a0db65a0e9585c1385 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 2 Oct 2020 14:59:13 +0200 Subject: [PATCH] avcodec/dxtory: Fix negative stride shift in dx2_decode_slice_420() Fixes: left shift of negative value -640 Fixes: 26044/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXTORY_fuzzer-5631057602543616 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer (cherry picked from commit 3291d994b76db4b6e67c8467367ce68f79785e60) Signed-off-by: Michael Niedermayer --- libavcodec/dxtory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c index a4b0db658e..1241bda1a7 100644 --- a/libavcodec/dxtory.c +++ b/libavcodec/dxtory.c @@ -502,7 +502,7 @@ static int dx2_decode_slice_420(GetBitContext *gb, int width, int height, V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80; } - Y += ystride << 1; + Y += ystride * 2; U += ustride; V += vstride; }