linux-kernel - [PATCH 08/11] Fix possible NULL pointer dereference in print_IO

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Message-Id: <1274725657-1149-8-git-send-email-stefano.stabellini@eu.citrix.com>
Date:	Mon, 24 May 2010 19:27:34 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	linux-kernel@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com, Don Dutile <ddutile@...hat.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH 08/11] Fix possible NULL pointer dereference in print_IO_APIC

Make sure chip_data is not NULL before accessing it (the VIRQ_TIMER
handler and virq handlers in general don't have any chip_data).

Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
---
 arch/x86/kernel/apic/io_apic.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index eb2789c..c64499c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1732,6 +1732,8 @@ __apicdebuginit(void) print_IO_APIC(void)
 		struct irq_pin_list *entry;
 
 		cfg = desc->chip_data;
+		if (!cfg)
+			continue;
 		entry = cfg->irq_2_pin;
 		if (!entry)
 			continue;
-- 
1.5.4.3

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