Patch "netlink: make sure nladdr has correct size in netlink_connect()" has been added to the 4.9-stable tree

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

netlink: make sure nladdr has correct size in netlink_connect()

to the 4.9-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:
netlink-make-sure-nladdr-has-correct-size-in-netlink_connect.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Alexander Potapenko <[email protected]>
Date: Fri, 23 Mar 2018 13:49:02 +0100
Subject: netlink: make sure nladdr has correct size in netlink_connect()

From: Alexander Potapenko <[email protected]>

[ Upstream commit 7880287981b60a6808f39f297bb66936e8bdf57a ]

KMSAN reports use of uninitialized memory in the case when |alen| is smaller than sizeof(struct sockaddr_nl), and therefore |nladdr| isn't fully copied from the userspace.

---
 net/netlink/af_netlink.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -1054,6 +1054,9 @@ static int netlink_connect(struct socket
 	if (addr->sa_family != AF_NETLINK)
 		return -EINVAL;
 
+	if (alen < sizeof(struct sockaddr_nl))
+		return -EINVAL;
+
 	if ((nladdr->nl_groups || nladdr->nl_pid) &&
 	    !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
 		return -EPERM;

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

queue-4.9/netlink-make-sure-nladdr-has-correct-size-in-netlink_connect.patch