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| author | Matthew Wilcox <willy@infradead.org> | 2018-12-28 07:22:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:42:30 -0800 |
| commit | 1a80dade010c7a7f4885a4c4c2a7ac22cc7b34df (patch) | |
| tree | 95cc3a11b8292c2abeb81fecec48739e2390d087 /kernel/pid.c | |
| parent | 00c569b567c7f1f0da6162868fd02a9f29411805 (diff) | |
| download | lwn-1a80dade010c7a7f4885a4c4c2a7ac22cc7b34df.tar.gz lwn-1a80dade010c7a7f4885a4c4c2a7ac22cc7b34df.zip | |
Fix failure path in alloc_pid()
The failure path removes the allocated PIDs from the wrong namespace.
This could lead to us inadvertently reusing PIDs in the leaf namespace
and leaking PIDs in parent namespaces.
Fixes: 95846ecf9dac ("pid: replace pid bitmap implementation with IDR API")
Cc: <stable@vger.kernel.org>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index b2f6c506035d..20881598bdfa 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -233,8 +233,10 @@ out_unlock: out_free: spin_lock_irq(&pidmap_lock); - while (++i <= ns->level) - idr_remove(&ns->idr, (pid->numbers + i)->nr); + while (++i <= ns->level) { + upid = pid->numbers + i; + idr_remove(&upid->ns->idr, upid->nr); + } /* On failure to allocate the first pid, reset the state */ if (ns->pid_allocated == PIDNS_ADDING) |