linux-kernel - [PATCH 3.12 082/100] netlabel: add address family checks to netlbl_{sock,req}

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Date:   Fri, 19 Aug 2016 09:11:21 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Paul Moore <paul@...l-moore.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 082/100] netlabel: add address family checks to netlbl_{sock,req}_delattr()

From: Paul Moore <paul@...l-moore.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 0e0e36774081534783aa8eeb9f6fbddf98d3c061 upstream.

It seems risky to always rely on the caller to ensure the socket's
address family is correct before passing it to the NetLabel kAPI,
especially since we see at least one LSM which didn't. Add address
family checks to the *_delattr() functions to help prevent future
problems.

Reported-by: Maninder Singh <maninder1.s@...sung.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/netlabel/netlabel_kapi.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 96a458e12f60..b7aa36fa522f 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -700,7 +700,11 @@ socket_setattr_return:
  */
 void netlbl_sock_delattr(struct sock *sk)
 {
-	cipso_v4_sock_delattr(sk);
+	switch (sk->sk_family) {
+	case AF_INET:
+		cipso_v4_sock_delattr(sk);
+		break;
+	}
 }
 
 /**
@@ -863,7 +867,11 @@ req_setattr_return:
 */
 void netlbl_req_delattr(struct request_sock *req)
 {
-	cipso_v4_req_delattr(req);
+	switch (req->rsk_ops->family) {
+	case AF_INET:
+		cipso_v4_req_delattr(req);
+		break;
+	}
 }
 
 /**
-- 
2.9.3