SLUB: Use unique end pointer for each slab page.

[linux-2.6] / ipc / sem.c

diff --git a/ipc/sem.c b/ipc/sem.c
index 7617f4f34edc4f914541c4b3d6fa2ce5f2c66e7e..d65e285b7e309de03d68cbef348929d0b23f961f 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -143,6 +143,7 @@ int sem_init_ns(struct ipc_namespace *ns)
 void sem_exit_ns(struct ipc_namespace *ns)
 {
        struct sem_array *sma;
+       struct kern_ipc_perm *perm;
        int next_id;
        int total, in_use;
 
@@ -151,10 +152,11 @@ void sem_exit_ns(struct ipc_namespace *ns)
        in_use = sem_ids(ns).in_use;
 
        for (total = 0, next_id = 0; total < in_use; next_id++) {
-               sma = idr_find(&sem_ids(ns).ipcs_idr, next_id);
-               if (sma == NULL)
+               perm = idr_find(&sem_ids(ns).ipcs_idr, next_id);
+               if (perm == NULL)
                        continue;
-               ipc_lock_by_ptr(&sma->sem_perm);
+               ipc_lock_by_ptr(perm);
+               sma = container_of(perm, struct sem_array, sem_perm);
                freeary(ns, sma);
                total++;
        }
@@ -181,6 +183,9 @@ static inline struct sem_array *sem_lock_check_down(struct ipc_namespace *ns,
 {
        struct kern_ipc_perm *ipcp = ipc_lock_check_down(&sem_ids(ns), id);
 
+       if (IS_ERR(ipcp))
+               return (struct sem_array *)ipcp;
+
        return container_of(ipcp, struct sem_array, sem_perm);
 }
 
@@ -192,6 +197,9 @@ static inline struct sem_array *sem_lock(struct ipc_namespace *ns, int id)
 {
        struct kern_ipc_perm *ipcp = ipc_lock(&sem_ids(ns), id);
 
+       if (IS_ERR(ipcp))
+               return (struct sem_array *)ipcp;
+
        return container_of(ipcp, struct sem_array, sem_perm);
 }
 
@@ -200,6 +208,9 @@ static inline struct sem_array *sem_lock_check(struct ipc_namespace *ns,
 {
        struct kern_ipc_perm *ipcp = ipc_lock_check(&sem_ids(ns), id);
 
+       if (IS_ERR(ipcp))
+               return (struct sem_array *)ipcp;
+
        return container_of(ipcp, struct sem_array, sem_perm);
 }
 
@@ -283,10 +294,10 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
        }
 
        id = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni);
-       if(id == -1) {
+       if (id < 0) {
                security_sem_free(sma);
                ipc_rcu_putref(sma);
-               return -ENOSPC;
+               return id;
        }
        ns->used_sems += nsems;