[PATCH] md/bitmap: check input value with ULONG_MAX in timeout_store

[linan666]

From: Li Nan <linan122@xxxxxxxxxx>

The type of timeout is unsigned long, but it is compared with 'LONG_MAX'
in timeout_store(), which lead to value within (LONG_MAX, ULONG_MAX.]/HZ
can't be set. Fix it by checking input value with ULONG_MAX.

Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
---
 drivers/md/md-bitmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index bc8d7565171d..5fd9cba65be8 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2460,7 +2460,7 @@ timeout_store(struct mddev *mddev, const char *buf, size_t len)
 		return rv;
 
 	/* just to make sure we don't overflow... */
-	if (timeout >= LONG_MAX / HZ)
+	if (timeout >= ULONG_MAX / HZ)
 		return -EINVAL;
 
 	timeout = timeout * HZ / 10000;
-- 
2.31.1