linux-kernel - [1/1] w1: fix w1_remove_master

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Message-ID: <20070815091112.GB28320@2ka.mipt.ru>
Date:	Wed, 15 Aug 2007 13:11:15 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...nel.org>
Subject: [1/1] w1: fix w1_remove_master_device() searching.

In case bus master driver provided bogus value as its private data,
search can be incorrect. Problem found by Adrian Bunk.

Signed-off-by: Evgeniy Polyakov <johnpol@....mipt.ru>

diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 2fbd8dd..6840dfe 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -170,22 +170,24 @@ void __w1_remove_master_device(struct w1_master *dev)
 
 void w1_remove_master_device(struct w1_bus_master *bm)
 {
-	struct w1_master *dev = NULL;
+	struct w1_master *dev, *found = NULL;
 
 	list_for_each_entry(dev, &w1_masters, w1_master_entry) {
 		if (!dev->initialized)
 			continue;
 
-		if (dev->bus_master->data == bm->data)
+		if (dev->bus_master->data == bm->data) {
+			found = dev;
 			break;
+		}
 	}
 
-	if (!dev) {
+	if (!found) {
 		printk(KERN_ERR "Device doesn't exist.\n");
 		return;
 	}
 
-	__w1_remove_master_device(dev);
+	__w1_remove_master_device(found);
 }
 
 EXPORT_SYMBOL(w1_add_master_device);

-- 
	Evgeniy Polyakov
-
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