[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 <wuni...@gmail.com>
---
 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