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authorEric W. Biederman <ebiederm@xmission.com>2014-01-20 15:26:15 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-06 11:08:16 -0800
commit9a8bd082503f4f91176d8fe0b91a23c5b768008e (patch)
treebd14ed7a2f8f211b8b89ddb8533fe5bfd4ba2010 /fs
parent209bd086e423d98ddf2fd52a6f1afda15b5758b1 (diff)
downloadlinaro-lsk-9a8bd082503f4f91176d8fe0b91a23c5b768008e.tar.gz
vfs: Is mounted should be testing mnt_ns for NULL or error.
commit 260a459d2e39761fbd39803497205ce1690bc7b1 upstream. A bug was introduced with the is_mounted helper function in commit f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e Author: Al Viro <viro@zeniv.linux.org.uk> Date: Sat Jun 9 00:59:08 2012 -0400 get rid of ->mnt_longterm it's enough to set ->mnt_ns of internal vfsmounts to something distinct from all struct mnt_namespace out there; then we can just use the check for ->mnt_ns != NULL in the fast path of mntput_no_expire() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> The intent was to test if the real_mount(vfsmount)->mnt_ns was NULL_OR_ERR but the code is actually testing real_mount(vfsmount) and always returning true. The result is d_absolute_path returning paths it should be hiding. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/mount.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/mount.h b/fs/mount.h
index 64a858143ff..68d80bdcd08 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -73,7 +73,7 @@ static inline int mnt_has_parent(struct mount *mnt)
static inline int is_mounted(struct vfsmount *mnt)
{
/* neither detached nor internal? */
- return !IS_ERR_OR_NULL(real_mount(mnt));
+ return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
}
extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);