linux-kernel - [PATCH 3.11 092/138] ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr

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Date:	Tue,  3 Jun 2014 12:38:58 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Liu Hua <sdu.liu@...wei.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 092/138] ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr

3.11.10.11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Liu Hua <sdu.liu@...wei.com>

commit 8fad87bca7ac9737e413ba5f1656f1114a8c314d upstream.

When we configure CONFIG_ARM_LPAE=y, pfn << PAGE_SHIFT will
overflow if pfn >= 0x100000 in copy_oldmem_page.
So use __pfn_to_phys for converting.

Signed-off-by: Liu Hua <sdu.liu@...wei.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/arm/kernel/crash_dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/crash_dump.c b/arch/arm/kernel/crash_dump.c
index 90c50d4b43f7..5d1286d51154 100644
--- a/arch/arm/kernel/crash_dump.c
+++ b/arch/arm/kernel/crash_dump.c
@@ -39,7 +39,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	if (!csize)
 		return 0;
 
-	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+	vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);
 	if (!vaddr)
 		return -ENOMEM;
 
-- 
1.9.1

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