From 106103d7b50cb119d03611203e11cf5acc1edab0 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
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 <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3291d994b76db4b6e67c8467367ce68f79785e60)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/dxtory.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c
index 7f684ca787..e5d710069d 100644
--- a/libavcodec/dxtory.c
+++ b/libavcodec/dxtory.c
@@ -501,7 +501,7 @@ static int dx2_decode_slice_420(GetBitContext *gb, AVFrame *frame,
V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
}
- Y += ystride << 1;
+ Y += ystride * 2;
U += ustride;
V += vstride;
}