gf_w64.c: fix integer overflow

Fix for Coverity issue (from Ceph):

CID 1193089 (#1 of 1): Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN)
 overflow_before_widen: Potentially overflowing expression 1 << g_r with type
 int (32 bits, signed) is evaluated using 32-bit arithmetic, and then used in
 a context that expects an expression of type uint64_t (64 bits, unsigned).

CID 1193090 (#1 of 1): Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN)
 overflow_before_widen: Potentially overflowing expression 1 << g_s with type
 int (32 bits, signed) is evaluated using 32-bit arithmetic, and then used in
 a context that expects an expression of type uint64_t (64 bits, unsigned).

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gf_w64.c b/src/gf_w64.c
index 7f9f965..de231db 100644
--- a/src/gf_w64.c
+++ b/src/gf_w64.c
@@ -840,8 +840,8 @@ void gf_w64_group_multiply_region(gf_t *gf, void *src, void *dest, gf_val_64_t v
   d64 = (uint64_t *) rd.d_start;
   dtop = (uint64_t *) rd.d_top;
 
-  smask = (1 << g_s) - 1;
-  rmask = (1 << g_r) - 1;
+  smask = ((uint64_t)1 << g_s) - 1;
+  rmask = ((uint64_t)1 << g_r) - 1;
 
   while (d64 < dtop) {
     a64 = *s64;