On Tue, Jul 31, 2018 at 05:00:37PM -0700, Kees Cook wrote:
> From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
>
> Add shift_overflow() helper to assist driver authors in ensuring that
> shift operations don't cause overflows or other odd conditions.
>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> [kees: tweaked comments and commit log, dropped unneeded assignment]
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
> include/linux/overflow.h | 31 +++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/include/linux/overflow.h b/include/linux/overflow.h
> index 8712ff70995f..69fc366ce865 100644
> --- a/include/linux/overflow.h
> +++ b/include/linux/overflow.h
> @@ -202,6 +202,37 @@
>
> #endif /* COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW */
>
> +/** check_shift_overflow() - Calculate a left-shifted value and check overflow
> + *
> + * @a: Value to be shifted
> + * @b: How many bits left to shift
The above @b should be @s
> +#define check_shift_overflow(a, s, d) ({ \
Should I run this series through the rdma tree?
Thanks,
Jason
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