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Wed, 11 Feb 2026 01:00:48 -0800 (PST) Received: from archlinux.attlocal.net ([2600:1700:5a68:7000::2f]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7966c254d5asm10805957b3.43.2026.02.11.01.00.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 01:00:48 -0800 (PST) To: ffmpeg-devel@ffmpeg.org Date: Wed, 11 Feb 2026 01:00:42 -0800 Message-ID: <20260211090042.3466410-1-hankang201222@gmail.com> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 X-MailFrom: SRS0=1ZK+=AP=gmail.com=hankang201222@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 Message-ID-Hash: OAVRQYMKAYJFLSIMMUCYH3BFQDMW2LIT X-Message-ID-Hash: OAVRQYMKAYJFLSIMMUCYH3BFQDMW2LIT X-Mailman-Approved-At: Wed, 11 Feb 2026 15:08:54 +0000 X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PATCH] libswscale/output: fix signed integer overflow in yuv2rgba64 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: Hankang Li via ffmpeg-devel Cc: Hankang Li Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: Clamp the intermediate alpha value within 19 bits, this prevents overflow. Note: This issue is only reproducible with --disable-x86asm. There is an existing issue in fate-sws-unscaled with --disable-x86asm (ticket #21113). This change does not introduce any new regressions. Signed-off-by: Hankang Li --- libswscale/output.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/libswscale/output.c b/libswscale/output.c index a3b8da54bf..afb3878170 100644 --- a/libswscale/output.c +++ b/libswscale/output.c @@ -1288,8 +1288,8 @@ yuv2rgba64_1_c_template(SwsInternal *c, const int32_t *buf0, Y2 += (1 << 13) - (1 << 29); if (hasAlpha) { - A1 = abuf0[i * 2 ] * (1 << 11); - A2 = abuf0[i * 2 + 1] * (1 << 11); + A1 = av_clip_uintp2(abuf0[i * 2 ], 19) * (1 << 11); + A2 = av_clip_uintp2(abuf0[i * 2 + 1], 19) * (1 << 11); A1 += 1 << 13; A2 += 1 << 13; @@ -1337,8 +1337,8 @@ yuv2rgba64_1_c_template(SwsInternal *c, const int32_t *buf0, Y2 += (1 << 13) - (1 << 29); if (hasAlpha) { - A1 = abuf0[i * 2 ] * (1 << 11); - A2 = abuf0[i * 2 + 1] * (1 << 11); + A1 = av_clip_uintp2(abuf0[i * 2 ], 19) * (1 << 11); + A2 = av_clip_uintp2(abuf0[i * 2 + 1], 19) * (1 << 11); A1 += 1 << 13; A2 += 1 << 13; -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org