linux-kernel - [11/17] powerpc/crashdump: Do not fail on NULL pointer dereferencing

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Date:	Fri, 11 Mar 2011 12:40:12 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Maxim Uvarov <muvarov@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Kamalesh babulal <kamalesh@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>
Subject: [11/17] powerpc/crashdump: Do not fail on NULL pointer dereferencing

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Maxim Uvarov <muvarov@...il.com>

commit 426b6cb478e60352a463a0d1ec75c1c9fab30b13 upstream.

Signed-off-by: Maxim Uvarov <muvarov@...il.com>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Kamalesh babulal <kamalesh@...ux.vnet.ibm.com>
cc: Anton Blanchard <anton@...ba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/powerpc/kernel/crash.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -377,6 +377,9 @@ void default_machine_crash_shutdown(stru
 	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);
 


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