Patch "isdn/i4l: fix buffer overflow" has been added to the 4.12-stable tree

This is a note to let you know that I've just added the patch titled

isdn/i4l: fix buffer overflow

to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
isdn-i4l-fix-buffer-overflow.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Annie Cherkaev <[email protected]>
Date: Sat, 15 Jul 2017 15:08:58 -0600
Subject: isdn/i4l: fix buffer overflow

From: Annie Cherkaev <[email protected]>

commit 9f5af546e6acc30f075828cb58c7f09665033967 upstream.

This fixes a potential buffer overflow in isdn_net.c caused by an unbounded strcpy.

[ ISDN seems to be effectively unmaintained, and the I4L driver in
particular is long deprecated, but in case somebody uses this..
- Linus ]

---
 drivers/isdn/i4l/isdn_common.c |    1 +
 drivers/isdn/i4l/isdn_net.c    |    5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)

@@ -1379,6 +1379,7 @@ isdn_ioctl(struct file *file, uint cmd,
 			if (arg) {
 				if (copy_from_user(bname, argp, sizeof(bname) - 1))
 					return -EFAULT;
+				bname[sizeof(bname)-1] = 0;
 			} else
 				return -EINVAL;
 			ret = mutex_lock_interruptible(&dev->mtx);

@@ -2611,10 +2611,9 @@ isdn_net_newslave(char *parm)
 	char newname[10];
 
 	if (p) {
-		/* Slave-Name MUST not be empty */
-		if (!strlen(p + 1))
+		/* Slave-Name MUST not be empty or overflow 'newname' */
+		if (strscpy(newname, p + 1, sizeof(newname)) <= 0)
 			return NULL;
-		strcpy(newname, p + 1);
 		*p = 0;
 		/* Master must already exist */
 		if (!(n = isdn_net_findif(parm)))

Patches currently in stable-queue which might be from [email protected] are

queue-4.12/isdn-i4l-fix-buffer-overflow.patch