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ipc ns: fix memory leak (idr)

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We have apparently had a memory leak since
7ca7e564e0 "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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Serge E. Hallyn 2009-12-15 16:47:27 -08:00 • committed by Linus Torvalds
commit 7d6feeb287
3 changed files with 3 additions and 0 deletions
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1
ipc/sem.c
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@ -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