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Commit 1345ee6a authored by Johannes Berg's avatar Johannes Berg Committed by Johannes Berg
Browse files

cfg80211: fix potential BSS memory leak and update 



In the odd case that while updating information from a beacon,
a BSS was found that is part of a hidden group, we drop the
new information. In this case, however, we leak the IE buffer
from the update, and erroneously update the entry's timestamp
so it will never time out. Fix both these issues.

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 021fcdc1

net/wireless/scan.c

+11 −5
Original line number Diff line number Diff line
@@ -698,11 +698,6 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, 
	found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR);



	if (found) {

		found->pub.beacon_interval = tmp->pub.beacon_interval;

		found->pub.signal = tmp->pub.signal;

		found->pub.capability = tmp->pub.capability;

		found->ts = tmp->ts;



		/* Update IEs */

		if (rcu_access_pointer(tmp->pub.proberesp_ies)) {

			const struct cfg80211_bss_ies *old;
@@ -723,6 +718,8 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, 


			if (found->pub.hidden_beacon_bss &&

			    !list_empty(&found->hidden_list)) {

				const struct cfg80211_bss_ies *f;



				/*

				 * The found BSS struct is one of the probe

				 * response members of a group, but we're
@@ -732,6 +729,10 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, 
				 * SSID to showing it, which is confusing so

				 * drop this information.

				 */



				f = rcu_access_pointer(tmp->pub.beacon_ies);

				kfree_rcu((struct cfg80211_bss_ies *)f,

					  rcu_head);

				goto drop;

			}
@@ -761,6 +762,11 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev, 
				kfree_rcu((struct cfg80211_bss_ies *)old,

					  rcu_head);

		}



		found->pub.beacon_interval = tmp->pub.beacon_interval;

		found->pub.signal = tmp->pub.signal;

		found->pub.capability = tmp->pub.capability;

		found->ts = tmp->ts;

	} else {

		struct cfg80211_internal_bss *new;

		struct cfg80211_internal_bss *hidden;