Commit 01123e23 authored Dec 09, 2010 by Sven Neumann Committed by John W. Linville Dec 13, 2010

cfg80211: update information elements in cached BSS struct



When a cached BSS struct is updated because a new beacon was received,
the code replaces the cached information elements by the IEs from the
new beacon. However it did not update the pub.information_elements
and pub.len_information_elements fields leaving them either pointing
to the old beacon IEs or in an inconsistent state where the data is
replaced by the new beacon IEs but len_information_elements still has
its value from the first beacon.

Fix this by updating the information elements fields if they are
pointing to beacon IEs.

Signed-off-by: Sven Neumann <s.neumann@raumfeld.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

parent 998d516d

net/wireless/scan.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -464,6 +464,9 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev,
		if (res->pub.beacon_ies) {
		size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
		size_t ielen = res->pub.len_beacon_ies;
		bool information_elements_is_beacon_ies =
		(found->pub.information_elements ==
		found->pub.beacon_ies);

		if (found->pub.beacon_ies &&
		!found->beacon_ies_allocated &&
		@@ -487,6 +490,14 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev,
		found->pub.len_beacon_ies = ielen;
		}
		}

		/* Override IEs if they were from a beacon before */
		if (information_elements_is_beacon_ies) {
		found->pub.information_elements =
		found->pub.beacon_ies;
		found->pub.len_information_elements =
		found->pub.len_beacon_ies;
		}
		}

		kref_put(&res->ref, bss_release);