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authorEric W. Biederman <ebiederm@xmission.com>2014-01-20 15:26:15 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2014-01-26 08:26:42 -0500
commit260a459d2e39761fbd39803497205ce1690bc7b1 (patch)
tree33b18a2cbb1bde334690948c43a107f419be981b
parent9fe55eea7e4b444bafc42fa0000cc2d1d2847275 (diff)
downloadop-kernel-dev-260a459d2e39761fbd39803497205ce1690bc7b1.zip
op-kernel-dev-260a459d2e39761fbd39803497205ce1690bc7b1.tar.gz
vfs: Is mounted should be testing mnt_ns for NULL or error.
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. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/mount.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/mount.h b/fs/mount.h
index d64c594..a17458c 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -74,7 +74,7 @@ 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 *);
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