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swscale/output: avoid signed overflow in yuv2rgb_write_full luma scaling

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Fixes: 523522305/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-4574409678716928
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
(cherry picked from commit f50e22c68d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-07-01 06:09:33 +02:00
parent eac6965d9c
commit 97e169f6ce
1 changed files with 2 additions and 2 deletions
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4
libswscale/output.c
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@@ -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;