linux-kernel - [PATCH 3.16.y-ckt 104/129] path

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Message-Id: <1432285114-9254-105-git-send-email-luis.henriques@canonical.com>
Date:	Fri, 22 May 2015 09:58:09 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 104/129] path_openat(): fix double fput()

3.16.7-ckt12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <viro@...iv.linux.org.uk>

commit f15133df088ecadd141ea1907f2c96df67c729f0 upstream.

path_openat() jumps to the wrong place after do_tmpfile() - it has
already done path_cleanup() (as part of path_lookupat() called by
do_tmpfile()), so doing that again can lead to double fput().

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
[ luis: backported to 3.16:
  - adjusted context as 3.16 doesn't have path_cleanup() helper,
    introduced by 893b7775a70e ("fs/namei.c: new helper (path_cleanup())") ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/namei.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 19ac9c89dbab..15fc3f5a5007 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3194,7 +3194,7 @@ static struct file *path_openat(int dfd, struct filename *pathname,
 
 	if (unlikely(file->f_flags & __O_TMPFILE)) {
 		error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
-		goto out;
+		goto out2;
 	}
 
 	error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
@@ -3232,6 +3232,7 @@ out:
 		path_put(&nd->root);
 	if (base)
 		fput(base);
+out2:
 	if (!(opened & FILE_OPENED)) {
 		BUG_ON(!error);
 		put_filp(file);
--
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