3.10-stable review patch. If anyone has any objections, please let me know.
------------------ From: Laura Abbott <[email protected]> commit efea3403d4b7c6d1dd5d5ac3234c161e8b314d66 upstream. The definition of virt_addr_valid is that virt_addr_valid should return true if and only if virt_to_page returns a valid pointer. The current definition of virt_addr_valid only checks against the virtual address range. There's no guarantee that just because a virtual address falls bewteen PAGE_OFFSET and high_memory the associated physical memory has a valid backing struct page. Follow the example of other architectures and convert to pfn_valid to verify that the virtual address is actually valid. The check for an address between PAGE_OFFSET and high_memory is still necessary as vmalloc/highmem addresses are not valid with virt_to_page. Cc: Will Deacon <[email protected]> Cc: Nicolas Pitre <[email protected]> Acked-by: Will Deacon <[email protected]> Signed-off-by: Laura Abbott <[email protected]> Signed-off-by: Russell King <[email protected]> Cc: Hou Pengyang <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/arm/include/asm/memory.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -274,7 +274,8 @@ static inline __deprecated void *bus_to_ #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) -#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) +#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ + && pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ) #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
