From: Alexey Dobriyan <adobriyan@openvz.org>
Date: Tue, 8 May 2007 07:25:45 +0000 (-0700)
Subject: Fix race between proc_get_inode() and remove_proc_entry()
X-Git-Tag: v2.6.22-rc1~758
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7695650a924a6859910c8c19dfa43b4d08224d66;p=pandora-kernel.git

Fix race between proc_get_inode() and remove_proc_entry()

proc_lookup				remove_proc_entry
===========				=================

lock_kernel();
spin_lock(&proc_subdir_lock);
[find PDE with refcount 0]
spin_unlock(&proc_subdir_lock);
					spin_lock(&proc_subdir_lock);
					[find PDE with refcount 0]
					[check refcount and free PDE]
					spin_unlock(&proc_subdir_lock);
proc_get_inode:
	de_get(de); /* boom */

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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