net: check return value for dst_alloc

return value of dst_alloc must be checked before use Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Author: madalinbucur

net/xfrm/xfrm_policy.c

@@ -1349,14 +1349,16 @@ static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
 BUG();
 }
 xdst = dst_alloc(dst_ops, NULL, 0, 0, 0);
-memset(&xdst->u.rt6.rt6i_table, 0, sizeof(*xdst) - sizeof(struct dst_entry));
-xfrm_policy_put_afinfo(afinfo);
 
-if (likely(xdst))
+if (likely(xdst)) {
+memset(&xdst->u.rt6.rt6i_table, 0,
+sizeof(*xdst) - sizeof(struct dst_entry));
 xdst->flo.ops = &xfrm_bundle_fc_ops;
-else
+} else
 xdst = ERR_PTR(-ENOBUFS);
 
+xfrm_policy_put_afinfo(afinfo);
+
 return xdst;
 }