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Subject[PATCH] 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>
---
ipc/msg.c | 1 +
ipc/sem.c | 1 +
ipc/shm.c | 1 +
3 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/ipc/msg.c b/ipc/msg.c
index 3559d53..861cc32 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -124,6 +124,7 @@ 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 7361041..23ce7ec 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -128,6 +128,7 @@ 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 26f9253..82ab773 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -102,6 +102,7 @@ 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

--
1.5.4.3


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