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>
diff --git a/ipc/msg.c b/ipc/msg.c
index 085bd58f..af42ef8 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -125,6 +125,7 @@
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 87c2b64..2f2a479 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -129,6 +129,7 @@
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 11bec62..e9b039f 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -101,6 +101,7 @@
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
