Patch "netfilter: x_tables: avoid out-of-bounds reads in xt_request_find_{match|target}" has been added to the 4.14-stable tree

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

    netfilter: x_tables: avoid out-of-bounds reads in xt_request_find_{match|target}

to the 4.14-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:
netfilter-x_tables-avoid-out-of-bounds-reads-in-xt_request_find_-match-target.patch
and it can be found in the queue-4.14 subdirectory.

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

From: Eric Dumazet <[email protected]>
Date: Wed, 24 Jan 2018 17:16:09 -0800
Subject: netfilter: x_tables: avoid out-of-bounds reads in xt_request_find_{match|target}

From: Eric Dumazet <[email protected]>

commit da17c73b6eb74aad3c3c0654394635675b623b3e upstream.

It looks like syzbot found its way into netfilter territory.

Issue here is that @name comes from user space and might not be null terminated.

Out-of-bound reads happen, KASAN is not happy.

v2 added similar fix for xt_request_find_target(), as Florian advised.

---
 net/netfilter/x_tables.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -209,6 +209,9 @@ xt_request_find_match(uint8_t nfproto, c
 {
 	struct xt_match *match;
 
+	if (strnlen(name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN)
+		return ERR_PTR(-EINVAL);
+
 	match = xt_find_match(nfproto, name, revision);
 	if (IS_ERR(match)) {
 		request_module("%st_%s", xt_prefix[nfproto], name);

@@ -251,6 +254,9 @@ struct xt_target *xt_request_find_target
 {
 	struct xt_target *target;
 
+	if (strnlen(name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN)
+		return ERR_PTR(-EINVAL);
+
 	target = xt_find_target(af, name, revision);
 	if (IS_ERR(target)) {
 		request_module("%st_%s", xt_prefix[af], name);

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

queue-4.14/kcm-check-if-sk_user_data-already-set-in-kcm_attach.patch queue-4.14/net_sched-gen_estimator-fix-lockdep-splat.patch queue-4.14/netfilter-x_tables-avoid-out-of-bounds-reads-in-xt_request_find_-match-target.patch queue-4.14/kcm-only-allow-tcp-sockets-to-be-attached-to-a-kcm-mux.patch queue-4.14/netfilter-xt_rateest-acquire-xt_rateest_mutex-for-hash-insert.patch