From: michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: michaelni <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH] avcodec/utvideodec: Set B for the width= 1 case in restore_median_planar_il() (PR #20872)
Date: Sat, 08 Nov 2025 22:44:33 -0000
Message-ID: <176264187373.25.13766757988203879845@2cb04c0e5124> (raw)
PR #20872 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20872
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20872.patch
Fixes: use of uninitialized memory
Fixes: 439878388/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5635866203848704
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 2a1a04c4b0cbe64a534d05ea1a321e6175f5bb2c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 8 Nov 2025 23:22:56 +0100
Subject: [PATCH] avcodec/utvideodec: Set B for the width= 1 case in
restore_median_planar_il()
Fixes: use of uninitialized memory
Fixes: 439878388/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5635866203848704
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/utvideodec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c
index bc02ac44d5..098706b705 100644
--- a/libavcodec/utvideodec.c
+++ b/libavcodec/utvideodec.c
@@ -457,7 +457,7 @@ static void restore_median_planar_il(UtvideoContext *c, uint8_t *src, ptrdiff_t
// second line - first element has top prediction, the rest uses median
C = bsrc[-stride2];
bsrc[0] += C;
- A = bsrc[0];
+ A = B = bsrc[0];
for (i = 1; i < FFMIN(width, 16); i++) { /* scalar loop (DSP need align 16) */
B = bsrc[i - stride2];
bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
--
2.49.1
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