[PATCH 3.12 001/116] prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts

[Greg Kroah-Hartman]

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

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

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

commit ede4cebce16f5643c61aedd6d88d9070a1d23a68 upstream.

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

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Reported-by: Michael Marineau <michael.marineau@xxxxxxxxxx>
Tested-by: Waiman Long <Waiman.Long@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/dcache.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2881,9 +2881,9 @@ static int prepend_path(const struct pat
 			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 pat
 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;


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