linux-kernel - [PATCH] elv_unregister: fix possible crash on module unload

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Message-ID: <20060822172213.GA401@oleg>
Date:	Tue, 22 Aug 2006 21:22:13 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Jens Axboe <axboe@...e.de>, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: [PATCH] elv_unregister: fix possible crash on module unload

An exiting task or process which didn't do I/O yet have no io context,
elv_unregister() should check it is not NULL.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 2.6.18-rc4/block/elevator.c~8_crash	2006-07-16 01:53:08.000000000 +0400
+++ 2.6.18-rc4/block/elevator.c	2006-08-22 21:13:06.000000000 +0400
@@ -765,7 +765,8 @@ void elv_unregister(struct elevator_type
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
 			task_lock(p);
-			e->ops.trim(p->io_context);
+			if (p->io_context)
+				e->ops.trim(p->io_context);
 			task_unlock(p);
 		} while_each_thread(g, p);
 		read_unlock(&tasklist_lock);

-
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