From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 13 Nov 2013 12:45:40 +0000 (-0500)
Subject: prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts
X-Git-Tag: v3.12.2~116
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9e5129ba8d3d65605683050f73f12dddbf3f8c00;p=thirdparty%2Fkernel%2Fstable.git

prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts

commit ede4cebce16f5643c61aedd6d88d9070a1d23a68 upstream.

... and equivalent is needed in 3.12; it's broken there as well

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reported-by: Michael Marineau <michael.marineau@coreos.com>
Tested-by: Waiman Long <Waiman.Long@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/dcache.c b/fs/dcache.c
index ae6ebb88ceff1..89f96719a29b3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2881,9 +2881,9 @@ static int prepend_path(const struct path *path,
 			const struct path *root,
 			char **buffer, int *buflen)
 {
-	struct dentry *dentry = path->dentry;
-	struct vfsmount *vfsmnt = path->mnt;
-	struct mount *mnt = real_mount(vfsmnt);
+	struct dentry *dentry;
+	struct vfsmount *vfsmnt;
+	struct mount *mnt;
 	int error = 0;
 	unsigned seq = 0;
 	char *bptr;
@@ -2893,6 +2893,9 @@ static int prepend_path(const struct path *path,
 restart:
 	bptr = *buffer;
 	blen = *buflen;
+	dentry = path->dentry;
+	vfsmnt = path->mnt;
+	mnt = real_mount(vfsmnt);
 	read_seqbegin_or_lock(&rename_lock, &seq);
 	while (dentry != root->dentry || vfsmnt != root->mnt) {
 		struct dentry * parent;