linux-kernel - Re: [PATCH] IB/uverbs: Add a check for uverbs_attr

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Date:   Tue, 22 Oct 2019 16:12:16 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/uverbs: Add a check for uverbs_attr_get

On Fri, Oct 18, 2019 at 04:15:34PM +0800, Chuhong Yuan wrote:
> Only uverbs_copy_to_struct_or_zero in uverbs_ioctl.c does not have a
> check for uverbs_attr_get.
> Although its usage in uverbs_response has a check for attr's validity,
> UVERBS_HANDLER does not.
> Therefore, it is better to add a check like other functions in
> uverbs_ioctl.c.
> 
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> ---
>  drivers/infiniband/core/uverbs_ioctl.c | 3 +++
>  1 file changed, 3 insertions(+)

The call in uverbs_ioctl.c is safe as well, that code path checks that
the attribute exists.

Still, it make sense that this check should be present, so applied to
for-next with a clearer commit message

Thanks,
Jason