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| author | Alexandre Rusev <arusev@ru.mvista.com> | 2008-02-26 18:42:10 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-02-29 22:47:20 +0000 |
| commit | 9ae3ae0bebb9a3a348dc233229008b126014889d (patch) | |
| tree | 84d6277d5e84576cc47fd815828352de99d3068f /arch/arm/mm | |
| parent | c710e39cbec4f3d60acd07f5356404a61bc1959a (diff) | |
| download | linux-9ae3ae0bebb9a3a348dc233229008b126014889d.tar.gz linux-9ae3ae0bebb9a3a348dc233229008b126014889d.tar.bz2 linux-9ae3ae0bebb9a3a348dc233229008b126014889d.zip | |
[ARM] 4839/1: fixes kernel Oops in /dev/mem device driver for memory map with PHYS_OFF
"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>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/mmap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 2728b0e7d2bb..3f6dc40b8353 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -120,6 +120,8 @@ full_search: */ int valid_phys_addr_range(unsigned long addr, size_t size) { + if (addr < PHYS_OFFSET) + return 0; if (addr + size > __pa(high_memory)) return 0; |