linux-kernel - [PATCH 5.14 160/169] autofs: fix wait name hash calculation in autofs

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Message-Id: <20211025191037.705260758@linuxfoundation.org>
Date:   Mon, 25 Oct 2021 21:15:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ian Kent <raven@...maw.net>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 5.14 160/169] autofs: fix wait name hash calculation in autofs_wait()

From: Ian Kent <raven@...maw.net>

commit 25f54d08f12feb593e62cc2193fedefaf7825301 upstream.

There's a mistake in commit 2be7828c9fefc ("get rid of autofs_getpath()")
that affects kernels from v5.13.0, basically missed because of me not
fully testing the change for Al.

The problem is that the hash calculation for the wait name qstr hasn't
been updated to account for the change to use dentry_path_raw(). This
prevents the correct matching an existing wait resulting in multiple
notifications being sent to the daemon for the same mount which must
not occur.

The problem wasn't discovered earlier because it only occurs when
multiple processes trigger a request for the same mount concurrently
so it only shows up in more aggressive testing.

Fixes: 2be7828c9fefc ("get rid of autofs_getpath()")
Cc: stable@...r.kernel.org
Signed-off-by: Ian Kent <raven@...maw.net>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/autofs/waitq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/autofs/waitq.c
+++ b/fs/autofs/waitq.c
@@ -358,7 +358,7 @@ int autofs_wait(struct autofs_sb_info *s
 		qstr.len = strlen(p);
 		offset = p - name;
 	}
-	qstr.hash = full_name_hash(dentry, name, qstr.len);
+	qstr.hash = full_name_hash(dentry, qstr.name, qstr.len);

 	if (mutex_lock_interruptible(&sbi->wq_mutex)) {
 		kfree(name);