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| author | Oleg Nesterov <oleg@redhat.com> | 2014-12-10 15:55:25 -0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-01-07 17:55:17 +0100 |
| commit | 259c1c876ea03d24f0d8eaccb122a7733607bd34 (patch) | |
| tree | cabfb4bfc9f685663c66bbd0ca34b1e7412ce4d9 /kernel | |
| parent | 6186e5361e7cfdc13545f468fe65d195fcf08e5f (diff) | |
| download | lwn-259c1c876ea03d24f0d8eaccb122a7733607bd34.tar.gz lwn-259c1c876ea03d24f0d8eaccb122a7733607bd34.zip | |
exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting
commit 24c037ebf5723d4d9ab0996433cee4f96c292a4d upstream.
alloc_pid() does get_pid_ns() beforehand but forgets to put_pid_ns() if it
fails because disable_pid_allocation() was called by the exiting
child_reaper.
We could simply move get_pid_ns() down to successful return, but this fix
tries to be as trivial as possible.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Sterling Alexander <stalexan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/pid.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index 9b9a26698144..82430c858d69 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -341,6 +341,8 @@ out: out_unlock: spin_unlock_irq(&pidmap_lock); + put_pid_ns(ns); + out_free: while (++i <= ns->level) free_pidmap(pid->numbers + i); |