diff --git a/include/net/flow.h b/include/net/flow.h
index ddf5f3c..3b44d72 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -97,7 +97,7 @@
 #define FLOW_DIR_FWD	2
 
 struct sock;
-typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
+typedef int (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
 			       void **objp, atomic_t **obj_refp);
 
 extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
diff --git a/net/core/flow.c b/net/core/flow.c
index f23e7e3..b16d31a 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -85,6 +85,14 @@
 	add_timer(&flow_hash_rnd_timer);
 }
 
+static void flow_entry_kill(int cpu, struct flow_cache_entry *fle)
+{
+	if (fle->object)
+		atomic_dec(fle->object_ref);
+	kmem_cache_free(flow_cachep, fle);
+	flow_count(cpu)--;
+}
+
 static void __flow_cache_shrink(int cpu, int shrink_to)
 {
 	struct flow_cache_entry *fle, **flp;
@@ -100,10 +108,7 @@
 		}
 		while ((fle = *flp) != NULL) {
 			*flp = fle->next;
-			if (fle->object)
-				atomic_dec(fle->object_ref);
-			kmem_cache_free(flow_cachep, fle);
-			flow_count(cpu)--;
+			flow_entry_kill(cpu, fle);
 		}
 	}
 }
@@ -220,24 +225,33 @@
 
 nocache:
 	{
+		int err;
 		void *obj;
 		atomic_t *obj_ref;
 
-		resolver(key, family, dir, &obj, &obj_ref);
+		err = resolver(key, family, dir, &obj, &obj_ref);
 
 		if (fle) {
-			fle->genid = atomic_read(&flow_cache_genid);
+			if (err) {
+				/* Force security policy check on next lookup */
+				*head = fle->next;
+				flow_entry_kill(cpu, fle);
+			} else {
+				fle->genid = atomic_read(&flow_cache_genid);
 
-			if (fle->object)
-				atomic_dec(fle->object_ref);
+				if (fle->object)
+					atomic_dec(fle->object_ref);
 
-			fle->object = obj;
-			fle->object_ref = obj_ref;
-			if (obj)
-				atomic_inc(fle->object_ref);
+				fle->object = obj;
+				fle->object_ref = obj_ref;
+				if (obj)
+					atomic_inc(fle->object_ref);
+			}
 		}
 		local_bh_enable();
 
+		if (err)
+			obj = ERR_PTR(err);
 		return obj;
 	}
 }
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 2a78616..fffdd34 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -883,30 +883,32 @@
 }
 EXPORT_SYMBOL(xfrm_policy_walk);
 
-/* Find policy to apply to this flow. */
-
+/*
+ * Find policy to apply to this flow.
+ *
+ * Returns 0 if policy found, else an -errno.
+ */
 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
 			     u8 type, u16 family, int dir)
 {
 	struct xfrm_selector *sel = &pol->selector;
-	int match;
+	int match, ret = -ESRCH;
 
 	if (pol->family != family ||
 	    pol->type != type)
-		return 0;
+		return ret;
 
 	match = xfrm_selector_match(sel, fl, family);
-	if (match) {
-		if (!security_xfrm_policy_lookup(pol, fl->secid, dir))
-			return 1;
-	}
+	if (match)
+		ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
 
-	return 0;
+	return ret;
 }
 
 static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
 						     u16 family, u8 dir)
 {
+	int err;
 	struct xfrm_policy *pol, *ret;
 	xfrm_address_t *daddr, *saddr;
 	struct hlist_node *entry;
@@ -922,7 +924,15 @@
 	chain = policy_hash_direct(daddr, saddr, family, dir);
 	ret = NULL;
 	hlist_for_each_entry(pol, entry, chain, bydst) {
-		if (xfrm_policy_match(pol, fl, type, family, dir)) {
+		err = xfrm_policy_match(pol, fl, type, family, dir);
+		if (err) {
+			if (err == -ESRCH)
+				continue;
+			else {
+				ret = ERR_PTR(err);
+				goto fail;
+			}
+		} else {
 			ret = pol;
 			priority = ret->priority;
 			break;
@@ -930,36 +940,53 @@
 	}
 	chain = &xfrm_policy_inexact[dir];
 	hlist_for_each_entry(pol, entry, chain, bydst) {
-		if (xfrm_policy_match(pol, fl, type, family, dir) &&
-		    pol->priority < priority) {
+		err = xfrm_policy_match(pol, fl, type, family, dir);
+		if (err) {
+			if (err == -ESRCH)
+				continue;
+			else {
+				ret = ERR_PTR(err);
+				goto fail;
+			}
+		} else if (pol->priority < priority) {
 			ret = pol;
 			break;
 		}
 	}
 	if (ret)
 		xfrm_pol_hold(ret);
+fail:
 	read_unlock_bh(&xfrm_policy_lock);
 
 	return ret;
 }
 
-static void xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
+static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
 			       void **objp, atomic_t **obj_refp)
 {
 	struct xfrm_policy *pol;
+	int err = 0;
 
 #ifdef CONFIG_XFRM_SUB_POLICY
 	pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
-	if (pol)
+	if (IS_ERR(pol)) {
+		err = PTR_ERR(pol);
+		pol = NULL;
+	}
+	if (pol || err)
 		goto end;
 #endif
 	pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
-
+	if (IS_ERR(pol)) {
+		err = PTR_ERR(pol);
+		pol = NULL;
+	}
 #ifdef CONFIG_XFRM_SUB_POLICY
 end:
 #endif
 	if ((*objp = (void *) pol) != NULL)
 		*obj_refp = &pol->refcnt;
+	return err;
 }
 
 static inline int policy_to_flow_dir(int dir)
@@ -1297,6 +1324,8 @@
 
 		policy = flow_cache_lookup(fl, dst_orig->ops->family,
 					   dir, xfrm_policy_lookup);
+		if (IS_ERR(policy))
+			return PTR_ERR(policy);
 	}
 
 	if (!policy)
@@ -1343,6 +1372,10 @@
 							    fl, family,
 							    XFRM_POLICY_OUT);
 			if (pols[1]) {
+				if (IS_ERR(pols[1])) {
+					err = PTR_ERR(pols[1]);
+					goto error;
+				}
 				if (pols[1]->action == XFRM_POLICY_BLOCK) {
 					err = -EPERM;
 					goto error;
@@ -1581,6 +1614,9 @@
 		pol = flow_cache_lookup(&fl, family, fl_dir,
 					xfrm_policy_lookup);
 
+	if (IS_ERR(pol))
+		return 0;
+
 	if (!pol) {
 		if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
 			xfrm_secpath_reject(xerr_idx, skb, &fl);
@@ -1599,6 +1635,8 @@
 						    &fl, family,
 						    XFRM_POLICY_IN);
 		if (pols[1]) {
+			if (IS_ERR(pols[1]))
+				return 0;
 			pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
 			npols ++;
 		}