Subject: [patch] isdn: fix a wrapping bug in isdn_ppp_ioctl()

From: Dan Carpenter <[email-masked]>
Date: Wed, 10 Oct 2012 12:42:18 +0300

"protos" is an array of unsigned longs and "i" is the number of bits in
an unsigned long so we need to use 1UL as well to prevent the shift
from wrapping around.

Signed-off-by: Dan Carpenter <[email-masked]>

diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index a1e7601..69b5b58 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -595,7 +595,7 @@ isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
 			j = ipc->num / (sizeof(long) * 8);
 			i = ipc->num % (sizeof(long) * 8);
 			if (j < 8)
-				protos[j] |= (0x1 << i);
+				protos[j] |= (1UL << i);
 			ipc = ipc->next;
 		}
 		if ((r = set_arg(argp, protos, 8 * sizeof(long))))