[BUG] infiniband: mlx5: a possible null-pointer dereference in set_roce_addr()

[Jia-Ju Bai]

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.


Best wishes,
Jia-Ju Bai