Commit 296f7bf7 authored by Ian Kent's avatar Ian Kent Committed by Linus Torvalds
Browse files

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: default avatarIan Kent <raven@themaw.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e64be33c

fs/autofs4/autofs_i.h

+1 −1
Original line number Diff line number Diff line
@@ -84,7 +84,7 @@ struct autofs_wait_queue { 
	pid_t tgid;

	/* This is for status reporting upon return */

	int status;

	atomic_t wait_ctr;

	unsigned int wait_ctr;

};



#define AUTOFS_SBI_MAGIC 0x6d4a556d

fs/autofs4/waitq.c

+9 −9
Original line number Diff line number Diff line
@@ -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? */

		kfree(wq);

	else

	wake_up_interruptible(&wq->queue);

	if (!--wq->wait_ctr)

		kfree(wq);

	mutex_unlock(&sbi->wq_mutex);



	return 0;

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE