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cfg80211: Purge frame registrations on iftype change

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commit c1d3ad84eae35414b6b334790048406bd6301b12 upstream.

Currently frame registrations are not purged, even when changing the
interface type.  This can lead to potentially weird situations where
frames possibly not allowed on a given interface type remain registered
due to the type switching happening after registration.

The kernel currently relies on userspace apps to actually purge the
registrations themselves, this is not something that the kernel should
rely on.

Add a call to cfg80211_mlme_purge_registrations() to forcefully remove
any registrations left over prior to switching the iftype.

Cc: stable@vger.kernel.org
Signed-off-by: Denis Kenzior <denkenz@gmail.com>
Link: https://lore.kernel.org/r/20190828211110.15005-1-denkenz@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis Kenzior 2019-08-28 16:11:10 -05:00 • committed by Greg Kroah-Hartman
parent c7925cc21f
commit b85938f66b
1 changed files with 1 additions and 0 deletions
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net/wireless/util.c
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@ -974,6 +974,7 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
}
cfg80211_process_rdev_events(rdev);
cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
}
err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);