From: Maxim Uvarov <muvarov@gmail.com>
Date: Tue, 11 May 2010 05:41:08 +0000 (+0000)
Subject: powerpc/crashdump: Do not fail on NULL pointer dereferencing
X-Git-Tag: v2.6.27.59~96
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=116a10e2564e9c2cdfdfcc3829f47cb88e514f58;p=thirdparty%2Fkernel%2Fstable.git

powerpc/crashdump: Do not fail on NULL pointer dereferencing

commit 426b6cb478e60352a463a0d1ec75c1c9fab30b13 upstream.

Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Kamalesh babulal <kamalesh@linux.vnet.ibm.com>
cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index f4a0188c4d368..b779818017871 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -377,6 +377,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
 	for_each_irq(i) {
 		struct irq_desc *desc = irq_desc + i;
 
+		if (!desc || !desc->chip || !desc->chip->eoi)
+			continue;
+
 		if (desc->status & IRQ_INPROGRESS)
 			desc->chip->eoi(i);