linux-kernel - [PATCH] wmi: check find_guid() return value to prevent oops

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Date:	Wed, 30 Dec 2009 01:19:12 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Paul Rolland <rol@...917.net>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	rol@...be.net, werner <w.landgraf@...ru>,
	linux-acpi@...r.kernel.org
Subject: [PATCH] wmi: check find_guid() return value to prevent oops

From: rol@...917.net <Paul Rolland>

Signed-off-by: rol@...917.net <Paul Rolland>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/platform/x86/wmi.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 9f93d6c..cc9ad74 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -492,8 +492,7 @@ wmi_notify_handler handler, void *data)
 	if (!guid || !handler)
 		return AE_BAD_PARAMETER;
 
-	find_guid(guid, &block);
-	if (!block)
+	if (!find_guid(guid, &block))
 		return AE_NOT_EXIST;
 
 	if (block->handler)
@@ -521,8 +520,7 @@ acpi_status wmi_remove_notify_handler(const char *guid)
 	if (!guid)
 		return AE_BAD_PARAMETER;
 
-	find_guid(guid, &block);
-	if (!block)
+	if (!find_guid(guid, &block))
 		return AE_NOT_EXIST;
 
 	if (!block->handler)
-- 
1.6.6.rc4.11.g129a5

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