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[PATCH 3.16 193/233] xfrm: NULL dereference on allocation failure

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  [PATCH 3.16 193/233] xfrm: NULL dereference on allocation failure Ben Hutchings <ben@decadent.org.uk> - 2017-09-10 01:10 +0200

#1729715 — [PATCH 3.16 193/233] xfrm: NULL dereference on allocation failure

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit e747f64336fc15e1c823344942923195b800aa1e upstream.

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@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/key/af_key.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1156,6 +1156,7 @@ static struct xfrm_state * pfkey_msg2xfr
 			goto out;
 	}
 
+	err = -ENOBUFS;
 	key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
 	if (sa->sadb_sa_auth) {
 		int keysize = 0;

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