CVE request: kernel: nl80211: missing check for valid SSID size in scan operations

[Petr Matousek <pmatouse () redhat com>]

In both trigger_scan and sched_scan operations, we were checking for the
SSID length before assigning the value correctly.  Since the memory was
just kzalloc'ed, the check was always failing and SSID with over 32
characters were allowed to go through.

This is causing a buffer overflow when copying the actual SSID to the
proper place.

Please note that it needs CAP_NET_ADMIN privileges.

Upstream commits:
208c72f4fe44fe09577e7975ba0e7fa0278f3d03
57a27e1d6a3bb9ad4efeebd3a8c71156d6207536

References:
https://bugzilla.redhat.com/show_bug.cgi?id=718152

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team