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[ARM] 4839/1: fixes kernel Oops in /dev/mem device driver for memory map with PHYS_OFF

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"cat /dev/mem" may cause kernel Oops for boards with PHYS_OFFSET != 0
because character device is mapped to addresses starting from zero
and there is no protection against such situation.
Patch just add this.

Signed-off-by: Alexandre Rusev <arusev@ru.mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Alexandre Rusev 2008-02-26 18:42:10 +01:00 committed by Russell King
parent c710e39cbe
commit 9ae3ae0beb
1 changed files with 2 additions and 0 deletions
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2
arch/arm/mm/mmap.c
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@ -120,6 +120,8 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
*/ */
int valid_phys_addr_range(unsigned long addr, size_t size) int valid_phys_addr_range(unsigned long addr, size_t size)
{ {
if (addr < PHYS_OFFSET)
return 0;
if (addr + size > __pa(high_memory)) if (addr + size > __pa(high_memory))
return 0; return 0;