From: Dan Carpenter
> Sent: 19 July 2021 06:38
...
> Not related to your patch but this code is bad. What it does is the
> "ifname" can be set as a module parameter. So instead of testing if it
> has been set, it uses the checking inside dev_alloc_name() to see if we
> can allocate what the user requested. If not then set it to "wlan%d".
> If we cannot allocate what the user wants then we should return an
> error.
>
> It should do:
>
> if (ifname[0] == '\0')
> strscpy(ifname, "wlan%d", sizeof(ifname));
>
> ret = dev_alloc_name(pnetdev, ifname);
> if (ret < 0) {
> dev_err(pnetdev, "allocating device name failed.\n");
> return NULL;
> }
I know only root can set module parameters, but having one
that contains a string used as a printf format seems
dangerous at best.
Isn't it best to let userspace rename the interfaces later on?
David
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