tree baabc7b1c604ee8a97b5dd5833d0569e7fc44b43
parent 8564e38206de2ff005a27c8d7c2ce3869a44f0dd
author Johannes Berg <johannes.berg@intel.com> 1475099097 +0200
committer Johannes Berg <johannes.berg@intel.com> 1475099723 +0200

cfg80211: wext: really don't store non-WEP keys

Jouni reported that during (repeated) wext_pmf test runs (from the
wpa_supplicant hwsim test suite) the kernel crashes. The reason is
that after the key is set, the wext code still unnecessarily stores
it into the key cache. Despite smatch pointing out an overflow, I
failed to identify the possibility for this in the code and missed
it during development of the earlier patch series.

In order to fix this, simply check that we never store anything but
WEP keys into the cache, adding a comment as to why that's enough.

Also, since the cache is still allocated early even if it won't be
used in many cases, add a comment explaining why - otherwise we'd
have to roll back key settings to the driver in case of allocation
failures, which is far more difficult.

Fixes: 89b706fb28e4 ("cfg80211: reduce connect key caching struct size")
Reported-by: Jouni Malinen <j@w1.fi>
Bisected-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>