linux-kernel - [78/98] ipc ns: fix memory leak (idr)

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Date:	Tue, 26 Jan 2010 15:34:44 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Serge E. Hallyn" <serue@...ibm.com>, Nick Piggin <npiggin@...e.de>
Subject: [78/98] ipc ns: fix memory leak (idr)

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Serge E. Hallyn <serue@...ibm.com>

commit 7d6feeb287c61aafa88f06345387b1188edf4b86 upstream.

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@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Acked-by: Nick Piggin <npiggin@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 ipc/msg.c |    1 +
 ipc/sem.c |    1 +
 ipc/shm.c |    1 +
 3 files changed, 3 insertions(+)

--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -125,6 +125,7 @@ void msg_init_ns(struct ipc_namespace *n
 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

--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -129,6 +129,7 @@ void sem_init_ns(struct ipc_namespace *n
 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

--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -101,6 +101,7 @@ static void do_shm_rmid(struct ipc_names
 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

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