linux-kernel - [ 062/100] vfs: dont BUG_ON() if following a /proc fd pseudo-symlink results in a symlink

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Date:	Tue, 12 Mar 2013 15:31:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dave Jones <davej@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 062/100] vfs: dont BUG_ON() if following a /proc fd pseudo-symlink results in a symlink

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

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

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit 7b54c165a0c012edbaeaa73c5c87cb73721eb580 upstream.

It's "normal" - it can happen if the file descriptor you followed was
opened with O_NOFOLLOW.

Reported-by: Dave Jones <davej@...hat.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/namei.c |    2 --
 1 file changed, 2 deletions(-)

--- a/fs/namei.c
+++ b/fs/namei.c
@@ -693,8 +693,6 @@ void nd_jump_link(struct nameidata *nd,
 	nd->path = *path;
 	nd->inode = nd->path.dentry->d_inode;
 	nd->flags |= LOOKUP_JUMPED;
-
-	BUG_ON(nd->inode->i_op->follow_link);
 }
 
 static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)


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