linux-kernel - [PATCH 08/13] Fix possible NULL pointer dereference in print_IO

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Date:	Mon, 21 Jun 2010 17:14:02 +0100
From:	stefano@...bellini.net
To:	linux-kernel@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com, Stefano.Stabellini@...citrix.com,
	sheng@...ux.intel.com, ddutile@...hat.com, jeremy@...p.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH 08/13] Fix possible NULL pointer dereference in print_IO_APIC

From: Stefano Stabellini <stefano.stabellini@...citrix.com>

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;
-- 
1.7.0.4

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