arm64: armv8_deprecated: ensure extension of addr

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commit 55de49f9aa 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: bd35a4adc4 ("arm64: Port SWP/SWPB emulation support from arm")
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Mark Rutland 2017-05-03 16:09:36 +01:00 • committed by Greg Kroah-Hartman

parent f2e4f4e538

commit 4775fbcc92

1 changed files with 2 additions and 1 deletions

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arch/arm64/kernel/armv8_deprecated.c

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