swscale/output: Fix integer overflow in alpha computation in yuv2gbrp16_full_X_c()

Fixes: signed integer overflow: 524280 * 4432 cannot be represented in type 'int'
Fixes: ticket8322
Found-by: Suhwan
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libswscale/output.c b/libswscale/output.c
index a793a89443269fe7a2b19ceb5c68ec8f7eb77cf8..9df6ba44c854a86fa88cf761cb7022c20b13876a 100644 (file)
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -2278,7 +2278,7 @@ yuv2gbrp16_full_X_c(SwsContext *c, const int16_t *lumFilter,
             A = -0x40000000;
 
             for (j = 0; j < lumFilterSize; j++)
-                A += alpSrc[j][i] * lumFilter[j];
+                A += alpSrc[j][i] * (unsigned)lumFilter[j];
 
             A >>= 1;
             A += 0x20002000;