[PATCH] rose: correct integer overflow check

[Insu Yun]

Since rose_ndevs is signed integer type,
it can be overflowed when it is negative.

Signed-off-by: Insu Yun <wuninsu@xxxxxxxxx>
---
 net/rose/af_rose.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 129d357..4f37fae 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -1514,7 +1514,8 @@ static int __init rose_proto_init(void)
 	int i;
 	int rc;
 
-	if (rose_ndevs > 0x7FFFFFFF/sizeof(struct net_device *)) {
+	if (rose_ndevs < 0 ||
+	    rose_ndevs > 0x7FFFFFFF / sizeof(struct net_device *)) {
 		printk(KERN_ERR "ROSE: rose_proto_init - rose_ndevs parameter to large\n");
 		rc = -EINVAL;
 		goto out;
-- 
1.9.1