Subject: [PATCH] sysvipc namespace Only free ids that are in use in ipc_free_ids
From: Eric W. Biederman <ebiederman@lnxi.com>
Date: 1132747813 -0700

---

 ipc/util.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

675019385ee6b5ca057f5d34d26e6ae2670918b4
diff --git a/ipc/util.c b/ipc/util.c
index 1a54abb..e1c1dd9 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -116,10 +116,12 @@ void ipc_free_ids(struct ipc_ids *ids, v
 	size = ids->entries->size;
 	for (id = 0; id < size; id++) {
 		struct kern_ipc_perm *p;
-		rcu_read_lock();
 		p = ids->entries->p[id];
-		spin_lock(&p->lock);
-		ipc_free(p);
+		if (p) {
+			rcu_read_lock();
+			spin_lock(&p->lock);
+			ipc_free(p);
+		}
 	}
 	BUG_ON(ids->in_use);
 	old = ids->entries;
-- 
1.0.GIT