[BUG] ipw2x00: possible null-pointer dereference in libipw_wx_set_encode()

[Tuo Li]

Hello,

Our static analysis tool finds a possible null-pointer dereference in 
the ipw2x00 driver in Linux 5.14.0-rc3:

The variable (*crypt)->ops is checked in:
360:    if (*crypt != NULL && (*crypt)->ops != NULL && 
strcmp((*crypt)->ops->name, "WEP") != 0)

This indicates that (*crypt)->ops can be NULL. If so, some possible 
null-pointer dereferences will occur:
407:    (*crypt)->ops->set_key(sec.keys[key], len, NULL, (*crypt)->priv);
417:    len = (*crypt)->ops->get_key(sec.keys[key], WEP_KEY_LEN, ...)

I am not quite sure whether these possible null-pointer dereferences are 
real and how to fix them if they are real.
Any feedback would be appreciated, thanks!

Reported-by: TOTE Robot <oslab@xxxxxxxxxxxxxxx>

Best wishes,
Tuo Li