autofs4: fix waitq memory leak

If an autofs mount becomes catatonic before autofs4_wait_release() is
called the wait queue counter will not be decremented down to zero and the
entry will never be freed.  There are also races decrementing the wait
counter in the wait release function.  To deal with this the counter needs
to be updated while holding the wait queue mutex and waiters need to be
woken up unconditionally when the wait is removed from the queue to ensure
we eventually free the wait.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 9 deletions

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index dd2914d7ad7f..3458dbc8fff0 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -46,6 +46,7 @@ void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
                         kfree(wq->name.name);
                         wq->name.name = NULL;
                 }
+                wq->wait_ctr--;
                 wake_up_interruptible(&wq->queue);
                 wq = nwq;
         }
@@ -380,7 +381,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                 wq->pid = current->pid;
                 wq->tgid = current->tgid;
                 wq->status = -EINTR; /* Status return if interrupted */
-                atomic_set(&wq->wait_ctr, 2);
+                wq->wait_ctr = 2;
                 mutex_unlock(&sbi->wq_mutex);
 
                 if (sbi->version < 5) {
@@ -406,7 +407,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                 /* autofs4_notify_daemon() may block */
                 autofs4_notify_daemon(sbi, wq, type);
         } else {
-                atomic_inc(&wq->wait_ctr);
+                wq->wait_ctr++;
                 mutex_unlock(&sbi->wq_mutex);
                 kfree(qstr.name);
                 DPRINTK("existing wait id = 0x%08lx, name = %.*s, nfy=%d",
@@ -442,8 +443,10 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
         status = wq->status;
 
         /* Are we the last process to need status? */
-        if (atomic_dec_and_test(&wq->wait_ctr))
+        mutex_lock(&sbi->wq_mutex);
+        if (!--wq->wait_ctr)
                 kfree(wq);
+        mutex_unlock(&sbi->wq_mutex);
 
         return status;
 }
@@ -467,14 +470,11 @@ int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_tok
         *wql = wq->next;        /* Unlink from chain */
         kfree(wq->name.name);
         wq->name.name = NULL;   /* Do not wait on this queue */
-        mutex_unlock(&sbi->wq_mutex);
-
         wq->status = status;
-
-        if (atomic_dec_and_test(&wq->wait_ctr)) /* Is anyone still waiting for this guy? */
+        wake_up_interruptible(&wq->queue);
+        if (!--wq->wait_ctr)
                 kfree(wq);
-        else
-                wake_up_interruptible(&wq->queue);
+        mutex_unlock(&sbi->wq_mutex);
 
         return 0;
 }