linux-kernel - [PATCH] IPMI: fix timeout list handling

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Message-ID: <20070130193731.GA12130@localdomain>
Date:	Tue, 30 Jan 2007 13:37:31 -0600
From:	Corey Minyard <minyard@....org>
To:	Andrew Morton <akpm@...l.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	David Barksdale <amatus@...net.org>
Subject: [PATCH] IPMI: fix timeout list handling

From: David Barksdale <amatus@...net.org>

This patch against the 2.6.20-rc6 kernel fixes a dangling pointer bug in
ipmi_timeout_handler. A list of timedout messages is not re-initialized
before reuse, causing the head of the list to point to freed memory.

Signed-off-by: David Barksdale <amatus@...net.org>
Signed-off-by: Corey Minyard <minyard@....org>
---
diff -ruNp linux-2.6.git.orig/drivers/char/ipmi/ipmi_msghandler.c linux-2.6.git/drivers/char/ipmi/ipmi_msghandler.c
--- linux-2.6.git.orig/drivers/char/ipmi/ipmi_msghandler.c	2007-01-30 10:32:14.000000000 -0600
+++ linux-2.6.git/drivers/char/ipmi/ipmi_msghandler.c	2007-01-30 10:33:50.000000000 -0600
@@ -3649,8 +3649,6 @@ static void ipmi_timeout_handler(long ti
 	unsigned long        flags;
 	int                  i;
 
-	INIT_LIST_HEAD(&timeouts);
-
 	rcu_read_lock();
 	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
 		/* See if any waiting messages need to be processed. */
@@ -3671,6 +3669,7 @@ static void ipmi_timeout_handler(long ti
 		/* Go through the seq table and find any messages that
 		   have timed out, putting them in the timeouts
 		   list. */
+		INIT_LIST_HEAD(&timeouts);
 		spin_lock_irqsave(&intf->seq_lock, flags);
 		for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
 			check_msg_timeout(intf, &(intf->seq_table[i]),

-
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