cfg80211: check regulatory request alpha2 early
authorLuis R. Rodriguez <mcgrof@do-not-panic.com>
Tue, 5 Nov 2013 17:18:01 +0000 (09:18 -0800)
committerJohannes Berg <johannes.berg@intel.com>
Mon, 25 Nov 2013 19:51:02 +0000 (20:51 +0100)
commite438768ff9b22c83a968e14b79e8c83128e8bfe4
tree956366ad035f64af8965c3a737eaa74598d1e1b6
parentcc493e4f5296f4da111f25ea4a216bb77270ccc6
cfg80211: check regulatory request alpha2 early

Currently nl80211 allows userspace to send the kernel
a bogus regulatory domain with at most 32 rules set
and it won't reject it until after its allocated
memory. Let's be smart about it and take advantage
that the last_request is now available under RTNL
and check if the alpha2 matches an expected request
and reject any bogus userspace requests prior to
hitting the memory allocator.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
net/wireless/nl80211.c
net/wireless/reg.c
net/wireless/reg.h