On Wed, May 24, 2017 at 10:56:49AM +0100, Mark Rutland wrote:
> commit 55de49f9aa17b0b2b144dd2af587177b9aadf429 upstream.
>
> Our compat swp emulation holds the compat user address in an unsigned
> int, which it passes to __user_swpX_asm(). When a 32-bit value is passed
> in a register, the upper 32 bits of the register are unknown, and we
> must extend the value to 64 bits before we can use it as a base address.
>
> This patch casts the address to unsigned long to ensure it has been
> suitably extended, avoiding the potential issue, and silencing a related
> warning from clang.
>
> Fixes: bd35a4adc413 ("arm64: Port SWP/SWPB emulation support from arm")
> Cc: <stable@xxxxxxxxxxxxxxx> # 3.19.x-
> Acked-by: Will Deacon <will.deacon@xxxxxxx>
> Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> ---
> arch/arm64/kernel/armv8_deprecated.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
Now applied, thanks.
greg k-h