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Sun, 9 Nov 2025 00:44:33 +0200 (EET) MIME-Version: 1.0 To: ffmpeg-devel@ffmpeg.org Date: Sat, 08 Nov 2025 22:44:33 -0000 Message-ID: <176264187373.25.13766757988203879845@2cb04c0e5124> Message-ID-Hash: WH7EPHAFCNZA2Y6G56YMC46HLCOMFKGC X-Message-ID-Hash: WH7EPHAFCNZA2Y6G56YMC46HLCOMFKGC X-MailFrom: code@ffmpeg.org X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PATCH] avcodec/utvideodec: Set B for the width= 1 case in restore_median_planar_il() (PR #20872) List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: michaelni via ffmpeg-devel Cc: michaelni Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: 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 >>From 2a1a04c4b0cbe64a534d05ea1a321e6175f5bb2c Mon Sep 17 00:00:00 2001 From: Michael Niedermayer 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 --- 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 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org