tree 67eed715e449fb7460f834c32edf723f2b4efa05
parent eb7903bb83cc1db31a9124d4cc8a1bddebe26e33
author Johannes Berg <johannes.berg@intel.com> 1483352369 +0100
committer Johannes Berg <johannes.berg@intel.com> 1483352905 +0100

mac80211: initialize fast-xmit 'info' later

In ieee80211_xmit_fast(), 'info' is initialized to point to the skb
that's passed in, but that skb may later be replaced by a clone (if
it was shared), leading to an invalid pointer.

This can lead to use-after-free and also later crashes since the
real SKB's info->hw_queue doesn't get initialized properly.

Fix this by assigning info only later, when it's needed, after the
skb replacement (may have) happened.

Cc: stable@vger.kernel.org
Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>