1 files changed, 9 insertions, 0 deletions

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 1d69f6649bff..95a8ef4a5073 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -312,6 +312,7 @@ static inline int avc_reclaim_node(void)
                 if (!spin_trylock_irqsave(&avc_cache.slots_lock[hvalue], flags))
                         continue;
 
+                rcu_read_lock();
                 list_for_each_entry(node, &avc_cache.slots[hvalue], list) {
                         if (atomic_dec_and_test(&node->ae.used)) {
                                 /* Recently Unused */
@@ -319,11 +320,13 @@ static inline int avc_reclaim_node(void)
                                 avc_cache_stats_incr(reclaims);
                                 ecx++;
                                 if (ecx >= AVC_CACHE_RECLAIM) {
+                                        rcu_read_unlock();
                                         spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
                                         goto out;
                                 }
                         }
                 }
+                rcu_read_unlock();
                 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
         }
 out:
@@ -821,8 +824,14 @@ int avc_ss_reset(u32 seqno)
 
         for (i = 0; i < AVC_CACHE_SLOTS; i++) {
                 spin_lock_irqsave(&avc_cache.slots_lock[i], flag);
+                /*
+                 * With preemptable RCU, the outer spinlock does not
+                 * prevent RCU grace periods from ending.
+                 */
+                rcu_read_lock();
                 list_for_each_entry(node, &avc_cache.slots[i], list)
                         avc_node_delete(node);
+                rcu_read_unlock();
                 spin_unlock_irqrestore(&avc_cache.slots_lock[i], flag);
         }