linux-kernel - Re: [BUG] infiniband: mlx5: a possible null-pointer dereference in set_roce

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Date:   Mon, 29 Jul 2019 08:20:43 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     dledford@...hat.com, jgg@...pe.ca, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] infiniband: mlx5: a possible null-pointer dereference in
 set_roce_addr()

On Mon, Jul 29, 2019 at 10:16:30AM +0800, Jia-Ju Bai wrote:
> In set_roce_addr(), there is an if statement on line 589 to check whether
> gid is NULL:
>     if (gid)
>
> When gid is NULL, it is used on line 613:
>     return mlx5_core_roce_gid_set(..., gid->raw, ...);
>
> Thus, a possible null-pointer dereference may occur.
>
> This bug is found by a static analysis tool STCheck written by us.
>
> I do not know how to correctly fix this bug, so I only report it.

You should fix the tool, gid and gid->raw are the same pointers in C.

In this case, "mlx5_core_roce_gid_set(..., gid->raw, ...);" will be
equal to "mlx5_core_roce_gid_set(..., NULL, ...);" and
mlx5_core_roce_gid_set() is designed to handle this case.

Thanks

>
>
> Best wishes,
> Jia-Ju Bai