[PATCH] Grow: fix resize of array component size to > 32bits

[Justin Maggard <jmaggard10@gmail.com>]

If the request --size to --grow an array to is larger
than 32bits, then mdadm may make the wrong choice and
use ioctl instead of setting component_size via sysfs
and the change is ignored.

Instead of using casts to check for a 32-bit overflow,
just check for set bits outside of INT32_MAX.
---
 Grow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Grow.c b/Grow.c
index a9c8589..a614102 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1818,7 +1818,7 @@ int Grow_reshape(char *devname, int fd,
 		if (s->size == MAX_SIZE)
 			s->size = 0;
 		array.size = s->size;
-		if (array.size != (signed)s->size) {
+		if (s->size & ~INT32_MAX) {
 			/* got truncated to 32bit, write to
 			 * component_size instead
 			 */
-- 
1.9.1