[PATCH] namei fixes (5/19)

fix for too early mntput() in open_namei() - we pin path.mnt down for the
duration of __do_follow_link().  Otherwise we could get the fs where our
symlink lived unmounted while we were in __do_follow_link().  That would end
up with dentry of symlink staying pinned down through the fs shutdown.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/namei.c b/fs/namei.c
index e42f7c35545a..020fb8c8d1cd 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1524,8 +1524,10 @@ do_link:
         error = security_inode_follow_link(path.dentry, nd);
         if (error)
                 goto exit_dput;
+        mntget(path.mnt);
         error = __do_follow_link(path.dentry, nd);
         dput(path.dentry);
+        mntput(path.mnt);
         path.mnt = nd->mnt;
         if (error)
                 return error;