PR #23291 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23291 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23291.patch
Fixes: 493055112/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-5823995319746560 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> >From 9a2d28f2ea8fcca06db24665c94106d1c4f64229 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer <[email protected]> Date: Sun, 31 May 2026 01:04:59 +0200 Subject: [PATCH] swscale/output: avoid signed overflow in yuv2rgba64_full_1 alpha Fixes: 493055112/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-5823995319746560 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> --- libswscale/output.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/libswscale/output.c b/libswscale/output.c index 396380ac72..003bff63a1 100644 --- a/libswscale/output.c +++ b/libswscale/output.c @@ -1499,7 +1499,7 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0, { const int32_t *ubuf0 = ubuf[0], *vbuf0 = vbuf[0]; int i; - int A = 0xffff<<14; + SUINT A = 0xffff<<14; if (uvalpha == 0) { for (i = 0; i < dstW; i++) { @@ -1513,7 +1513,7 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0, Y += (1 << 13) - (1 << 29); if (hasAlpha) { - A = abuf0[i] * (1 << 11); + A = abuf0[i] * (SUINT)(1 << 11); A += 1 << 13; } @@ -1535,7 +1535,7 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0, } else { const int32_t *ubuf1 = ubuf[1], *vbuf1 = vbuf[1]; unsigned uvalpha1 = 4096 - uvalpha; - int A = 0xffff<<14; + SUINT A = 0xffff<<14; av_assert2(uvalpha <= 4096U); for (i = 0; i < dstW; i++) { @@ -1549,7 +1549,7 @@ yuv2rgba64_full_1_c_template(SwsInternal *c, const int32_t *buf0, Y += (1 << 13) - (1 << 29); if (hasAlpha) { - A = abuf0[i] * (1 << 11); + A = abuf0[i] * (SUINT)(1 << 11); A += 1 << 13; } -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
