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authorPavel Emelianov <xemul@openvz.org>2006-11-02 22:07:03 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-11-03 12:27:56 -0800
commitc7e12b838989b0e432c7a1cdf1e6c6fd936007f6 (patch)
tree31a6eea1d9ace0b467ab6bb209dd6a883910d682 /ipc
parent733b72c31efb0d6b29577655939ccfe835381b52 (diff)
downloadlinux-c7e12b838989b0e432c7a1cdf1e6c6fd936007f6.tar.gz
[PATCH] Fix ipc entries removal
Fix two issuses related to ipc_ids->entries freeing. 1. When freeing ipc namespace we need to free entries allocated with ipc_init_ids(). 2. When removing old entries in grow_ary() ipc_rcu_putref() may be called on entries set to &ids->nullentry earlier in ipc_init_ids(). This is almost impossible without namespaces, but with them this situation becomes possible. Found during OpenVZ testing after obvious leaks in beancounters. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Cc: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/msg.c1
-rw-r--r--ipc/sem.c1
-rw-r--r--ipc/shm.c1
-rw-r--r--ipc/util.c2
-rw-r--r--ipc/util.h12
5 files changed, 16 insertions, 1 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 5b213d95254..600e06f943a 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -124,6 +124,7 @@ void msg_exit_ns(struct ipc_namespace *ns)
}
mutex_unlock(&msg_ids(ns).mutex);
+ ipc_fini_ids(ns->ids[IPC_MSG_IDS]);
kfree(ns->ids[IPC_MSG_IDS]);
ns->ids[IPC_MSG_IDS] = NULL;
}
diff --git a/ipc/sem.c b/ipc/sem.c
index 0dafcc455f9..21b3289d640 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -161,6 +161,7 @@ void sem_exit_ns(struct ipc_namespace *ns)
}
mutex_unlock(&sem_ids(ns).mutex);
+ ipc_fini_ids(ns->ids[IPC_SEM_IDS]);
kfree(ns->ids[IPC_SEM_IDS]);
ns->ids[IPC_SEM_IDS] = NULL;
}
diff --git a/ipc/shm.c b/ipc/shm.c
index bfbd317ec11..d1198dd07a1 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -116,6 +116,7 @@ void shm_exit_ns(struct ipc_namespace *ns)
}
mutex_unlock(&shm_ids(ns).mutex);
+ ipc_fini_ids(ns->ids[IPC_SHM_IDS]);
kfree(ns->ids[IPC_SHM_IDS]);
ns->ids[IPC_SHM_IDS] = NULL;
}
diff --git a/ipc/util.c b/ipc/util.c
index 42479e4eec5..cd8bb14a431 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -301,7 +301,7 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
*/
rcu_assign_pointer(ids->entries, new);
- ipc_rcu_putref(old);
+ __ipc_fini_ids(ids, old);
return newsize;
}
diff --git a/ipc/util.h b/ipc/util.h
index c8fd6b9d77b..e3aa2c5c97d 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -83,6 +83,18 @@ void* ipc_rcu_alloc(int size);
void ipc_rcu_getref(void *ptr);
void ipc_rcu_putref(void *ptr);
+static inline void __ipc_fini_ids(struct ipc_ids *ids,
+ struct ipc_id_ary *entries)
+{
+ if (entries != &ids->nullentry)
+ ipc_rcu_putref(entries);
+}
+
+static inline void ipc_fini_ids(struct ipc_ids *ids)
+{
+ __ipc_fini_ids(ids, ids->entries);
+}
+
struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);