linux-kernel - [PATCH 3.10 049/103] ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr

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Message-Id: <20140604232548.430458806@linuxfoundation.org>
Date:	Wed,  4 Jun 2014 16:25:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Liu Hua <sdu.liu@...wei.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH 3.10 049/103] ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr

3.10-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/kernel/crash_dump.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 p
 	if (!csize)
 		return 0;
 
-	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+	vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);
 	if (!vaddr)
 		return -ENOMEM;
 


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