Re: nl80211 NULL pointer dereference

From: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Date: Tue, 18 Jun 2013 15:46:13 -1000

Hmm. Maybe this is old, but I don't think I've seen it before (who
knows, maybe it has killed the machine before, I had a hard hang the
other day).

It's a NULL pointer dereference in nl80211_set_reg() on my Pixel. The
machine kind of stayed up afterwards, although with no working
wireless, and it would not shut down cleanly presumably due to locks
held etc.

Any ideas? I'm including the few wireless-related messages that
happened justr before the oops. Being a pixel, this is with the ath9k
driver.

nl80211_set_reg() is really careful about validating which netlink
attributes the user has specified, and either not dereferencing or
signalling an error when NULL is seen.

Hmmm...
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