[FFmpeg-cvslog] swscale/yuv2rgb: Use 64bit for brightness computation

[Michael Niedermayer]

ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Tue May 21 01:35:08 2024 +0200| [3b94cf8b20b683c26503fb5fcf2ae1e137d39764] | committer: Michael Niedermayer

swscale/yuv2rgb: Use 64bit for brightness computation

This will not overflow for normal values
Fixes: CID1500280 Unintentional integer overflow

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit bfc22f364d31d8f2dc2acae1bd03d5894a00b8c5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3b94cf8b20b683c26503fb5fcf2ae1e137d39764
---

 libswscale/yuv2rgb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswscale/yuv2rgb.c b/libswscale/yuv2rgb.c
index 6ee483d12a..5f21ff9c52 100644
--- a/libswscale/yuv2rgb.c
+++ b/libswscale/yuv2rgb.c
@@ -829,7 +829,7 @@ av_cold int ff_yuv2rgb_c_init_tables(SwsContext *c, const int inv_table[4],
     cbu  = (cbu * contrast * saturation) >> 32;
     cgu  = (cgu * contrast * saturation) >> 32;
     cgv  = (cgv * contrast * saturation) >> 32;
-    oy  -= 256 * brightness;
+    oy  -= 256LL * brightness;
 
     c->uOffset = 0x0400040004000400LL;
     c->vOffset = 0x0400040004000400LL;