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new f50e22c68d swscale/output: avoid signed overflow in yuv2rgb_write_full
luma scaling
f50e22c68d is described below
commit f50e22c68d1e579a3e2818a7d93d6eed092ad387
Author: Michael Niedermayer <[email protected]>
AuthorDate: Wed Jul 1 06:09:33 2026 +0200
Commit: michaelni <[email protected]>
CommitDate: Sun Jul 5 00:05:36 2026 +0000
swscale/output: avoid signed overflow in yuv2rgb_write_full luma scaling
Fixes:
523522305/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-4574409678716928
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
---
libswscale/output.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libswscale/output.c b/libswscale/output.c
index cea7fb1185..760dca642e 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -2003,8 +2003,8 @@ static av_always_inline void
yuv2rgb_write_full(SwsInternal *c,
int isrgb8 = target == AV_PIX_FMT_BGR8 || target == AV_PIX_FMT_RGB8;
Y -= c->yuv2rgb_y_offset;
- Y *= c->yuv2rgb_y_coeff;
- Y += 1 << 21;
+ Y *= (unsigned)c->yuv2rgb_y_coeff;
+ Y += 1U << 21;
R = (unsigned)Y + V*(unsigned)c->yuv2rgb_v2r_coeff;
G = (unsigned)Y + V*(unsigned)c->yuv2rgb_v2g_coeff +
U*(unsigned)c->yuv2rgb_u2g_coeff;
B = (unsigned)Y +
U*(unsigned)c->yuv2rgb_u2b_coeff;
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