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SubjectRe: [PATCH][next] RDMA/mlx4: Copy union directly
On Tue, Aug 15, 2023 at 02:39:53PM -0600, Gustavo A. R. Silva wrote:
> Copy union directly instead of using memcpy().
>
> Note that in this case, a direct assignment is more readable and
> consistent with the subsequent assignments.
>
> This addresses the following -Wstringop-overflow warning seen in s390
> with defconfig:
> drivers/infiniband/hw/mlx4/main.c:296:33: warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
> 296 | memcpy(&port_gid_table->gids[free].gid,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 297 | &attr->gid, sizeof(attr->gid));
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hm, why did it think the union had a size of 0?

Regardless, it's a nice fix:

Reviewed-by: Kees Cook <keescook@chromium.org>

--
Kees Cook

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