[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>
diff --git a/fs/namei.c b/fs/namei.c
index e42f7c3..020fb8c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1524,8 +1524,10 @@
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;