commit 59cd0cbc75367b82f704f63b104117462275060d
author Darrick J. Wong <djwong@us.ibm.com> Tue May 08 00:25:47 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Tue May 08 11:15:02 2007 -0700
tree 695c4f7af4cf840a7e22e7767e1b5705e0b6d8d1
parent 7695650a924a6859910c8c19dfa43b4d08224d66

Fix race between proc_readdir and remove_proc_entry

Fix the following race:

proc_readdir				remove_proc_entry
============				=================

spin_lock(&proc_subdir_lock);
[choose PDE to start filldir from]
spin_unlock(&proc_subdir_lock);
					spin_lock(&proc_subdir_lock);
					[find PDE]
					[free PDE, refcount is 0]
					spin_unlock(&proc_subdir_lock);
		    /* boom */
if (filldir(dirent, de->name, ...

[de_put on error path --adobriyan]
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>