[FFmpeg-cvslog] swscale/output: Avoid undefined overflow in yuv2rgb_write_full()

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun 16 01:59:23 2024 +0200| [8b56b03028e0b85267e35f3795a48ec49f24ae60] | committer: Michael Niedermayer

swscale/output: Avoid undefined overflow in yuv2rgb_write_full()

Fixes: signed integer overflow: -140140 * 16525 cannot be represented in type 'int'
Fixes: 68859/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-4516387130245120

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c221c7422f07f2245db5c4cdc958b42ca25eb2b7)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8b56b03028e0b85267e35f3795a48ec49f24ae60
---

 libswscale/output.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libswscale/output.c b/libswscale/output.c
index 23456ffe97..d53fb8c828 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -1850,9 +1850,9 @@ static av_always_inline void yuv2rgb_write_full(SwsContext *c,
     Y -= c->yuv2rgb_y_offset;
     Y *= c->yuv2rgb_y_coeff;
     Y += 1 << 21;
-    R = (unsigned)Y + V*c->yuv2rgb_v2r_coeff;
-    G = (unsigned)Y + V*c->yuv2rgb_v2g_coeff + U*c->yuv2rgb_u2g_coeff;
-    B = (unsigned)Y +                          U*c->yuv2rgb_u2b_coeff;
+    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;
     if ((R | G | B) & 0xC0000000) {
         R = av_clip_uintp2(R, 30);
         G = av_clip_uintp2(G, 30);