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authorSerge E. Hallyn <serue@us.ibm.com>2009-12-15 16:47:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:09 -0800
commit7d6feeb287c61aafa88f06345387b1188edf4b86 (patch)
treeb07d1033d8980256d596686d75c2207b1f2cce0a /ipc
parent1be53963b0519bd3681749a9bed8b83aeb005cca (diff)
downloadlinux-2.6.38-lt-ux500-7d6feeb287c61aafa88f06345387b1188edf4b86.tar.gz
ipc ns: fix memory leak (idr)
We have apparently had a memory leak since 7ca7e564e049d8b350ec9d958ff25eaa24226352 "ipc: store ipcs into IDRs" in 2007. The idr of which 3 exist for each ipc namespace is never freed. This patch simply frees them when the ipcns is freed. I don't believe any idr_remove() are done from rcu (and could therefore be delayed until after this idr_destroy()), so the patch should be safe. Some quick testing showed no harm, and the memory leak fixed. Caught by kmemleak. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/msg.c1
-rw-r--r--ipc/sem.c1
-rw-r--r--ipc/shm.c1
3 files changed, 3 insertions, 0 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 085bd58f2f0..af42ef8900a 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -125,6 +125,7 @@ void msg_init_ns(struct ipc_namespace *ns)
void msg_exit_ns(struct ipc_namespace *ns)
{
free_ipcs(ns, &msg_ids(ns), freeque);
+ idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
}
#endif
diff --git a/ipc/sem.c b/ipc/sem.c
index 87c2b641fd7..2f2a4795957 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -129,6 +129,7 @@ void sem_init_ns(struct ipc_namespace *ns)
void sem_exit_ns(struct ipc_namespace *ns)
{
free_ipcs(ns, &sem_ids(ns), freeary);
+ idr_destroy(&ns->ids[IPC_SEM_IDS].ipcs_idr);
}
#endif
diff --git a/ipc/shm.c b/ipc/shm.c
index 11bec626c22..e9b039f7412 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -101,6 +101,7 @@ static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
void shm_exit_ns(struct ipc_namespace *ns)
{
free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
+ idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);
}
#endif