netdev - [PATCH] xfrm: NULL dereference on allocation failure

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Message-ID: <20170614103537.GJ29394@elgon.mountain>
Date:   Wed, 14 Jun 2017 13:35:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        Trent Jaeger <tjaeger@....psu.edu>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] xfrm: NULL dereference on allocation failure

The default error code in pfkey_msg2xfrm_state() is -ENOBUFS.  We
added a new call to security_xfrm_state_alloc() which sets "err" to zero
so there several places where we can return ERR_PTR(0) if kmalloc()
fails.  The caller is expecting error pointers so it leads to a NULL
dereference.

Fixes: df71837d5024 ("[LSM-IPSec]: Security association restriction.")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 86051b5879f2..02e6865421e8 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1157,6 +1157,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 			goto out;
 	}
 
+	err = -ENOBUFS;
 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
 	if (sa->sadb_sa_auth) {
 		int keysize = 0;