linux-kernel - [patch v2] rapidio: use after free in unregister function

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Message-ID: <20130705203908.GA7594@elgon.mountain>
Date:	Fri, 5 Jul 2013 23:39:08 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Matt Porter <mporter@...nel.crashing.org>
Cc:	Alexandre Bounine <alexandre.bounine@....com>,
	Ryan Mallon <rmallon@...il.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch v2] rapidio: use after free in unregister function

We're freeing the list iterator so we can't move to the next entry.
Since there is only one matching mport_id, we can just break after
finding it.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: cleaner fix than v1

diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index f4f30af..2e8a20c 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1715,11 +1715,13 @@ int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
 		    (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
 			port->nscan = NULL;
 
-	list_for_each_entry(scan, &rio_scans, node)
+	list_for_each_entry(scan, &rio_scans, node) {
 		if (scan->mport_id == mport_id) {
 			list_del(&scan->node);
 			kfree(scan);
+			break;
 		}
+	}
 
 	mutex_unlock(&rio_mport_list_lock);
 
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