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| author | Serge E. Hallyn <serue@us.ibm.com> | 2009-12-15 16:47:27 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-28 15:20:38 -0800 |
| commit | f653e714dfd24c86d63e6f661a61cd167a2535e6 (patch) | |
| tree | 6d639fb62d795611072bd0881293b113c84e40cc | |
| parent | 4fbebe26d7a5eed6c1900bf2142b68af7df38462 (diff) | |
| download | lwn-f653e714dfd24c86d63e6f661a61cd167a2535e6.tar.gz lwn-f653e714dfd24c86d63e6f661a61cd167a2535e6.zip | |
ipc ns: fix memory leak (idr)
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@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | ipc/msg.c | 1 | ||||
| -rw-r--r-- | ipc/sem.c | 1 | ||||
| -rw-r--r-- | ipc/shm.c | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index 2ceab7f12fcb..779f7622ebcb 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 9eb9d31d6e5d..0c0b28ece0cc 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 35a65be64331..37caa449e9ec 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -100,6 +100,7 @@ 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 |