Patch "xfrm: check id proto in validate_tmpl()" 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

xfrm: check id proto in validate_tmpl()

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:
xfrm-check-id-proto-in-validate_tmpl.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: Cong Wang <[email protected]>
Date: Mon, 27 Nov 2017 11:15:16 -0800
Subject: xfrm: check id proto in validate_tmpl()

From: Cong Wang <[email protected]>

commit 6a53b7593233ab9e4f96873ebacc0f653a55c3e1 upstream.

syzbot reported a kernel warning in xfrm_state_fini(), which indicates that we have entries left in the list net->xfrm.state_all whose proto is zero. And xfrm_id_proto_match() doesn't consider them as a match with IPSEC_PROTO_ANY in this case.

Proto with value 0 is probably not a valid value, at least verify_newsa_info() doesn't consider it valid either.

This patch fixes it by checking the proto value in validate_tmpl() and rejecting invalid ones, like what iproute2 does in xfrm_xfrmproto_getbyname().

---
 net/xfrm/xfrm_user.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

@@ -1406,6 +1406,21 @@ static int validate_tmpl(int nr, struct
 		default:
 			return -EINVAL;
 		}
+
+		switch (ut[i].id.proto) {
+		case IPPROTO_AH:
+		case IPPROTO_ESP:
+		case IPPROTO_COMP:
+#if IS_ENABLED(CONFIG_IPV6)
+		case IPPROTO_ROUTING:
+		case IPPROTO_DSTOPTS:
+#endif
+		case IPSEC_PROTO_ANY:
+			break;
+		default:
+			return -EINVAL;
+		}
+
 	}
 
 	return 0;

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

queue-4.9/netfilter-xt_cgroup-initialize-info-priv-in-cgroup_mt_check_v1.patch queue-4.9/netfilter-xt_rateest-acquire-xt_rateest_mutex-for-hash-insert.patch queue-4.9/xfrm-check-id-proto-in-validate_tmpl.patch