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authorJohannes Berg <johannes.berg@intel.com>2022-10-06 00:11:43 +0300
committerJohannes Berg <johannes.berg@intel.com>2022-10-10 10:51:34 +0300
commitc90b93b5b782891ebfda49d4e5da36632fefd5d1 (patch)
tree9aefd55d0b1205879119e9ed443c6847968017a3 /net/wireless/scan.c
parentb2d03cabe2b2e150ff5a381731ea0355459be09f (diff)
downloadlinux-c90b93b5b782891ebfda49d4e5da36632fefd5d1.tar.xz
wifi: cfg80211: update hidden BSSes to avoid WARN_ON
When updating beacon elements in a non-transmitted BSS, also update the hidden sub-entries to the same beacon elements, so that a future update through other paths won't trigger a WARN_ON(). The warning is triggered because the beacon elements in the hidden BSSes that are children of the BSS should always be the same as in the parent. Reported-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de> Tested-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de> Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning") Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/scan.c')
-rw-r--r--net/wireless/scan.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 703b05c6c43e..806a5f1330ff 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1607,6 +1607,23 @@ struct cfg80211_non_tx_bss {
u8 bssid_index;
};
+static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
+ const struct cfg80211_bss_ies *new_ies,
+ const struct cfg80211_bss_ies *old_ies)
+{
+ struct cfg80211_internal_bss *bss;
+
+ /* Assign beacon IEs to all sub entries */
+ list_for_each_entry(bss, &known->hidden_list, hidden_list) {
+ const struct cfg80211_bss_ies *ies;
+
+ ies = rcu_access_pointer(bss->pub.beacon_ies);
+ WARN_ON(ies != old_ies);
+
+ rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
+ }
+}
+
static bool
cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
struct cfg80211_internal_bss *known,
@@ -1630,7 +1647,6 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
} else if (rcu_access_pointer(new->pub.beacon_ies)) {
const struct cfg80211_bss_ies *old;
- struct cfg80211_internal_bss *bss;
if (known->pub.hidden_beacon_bss &&
!list_empty(&known->hidden_list)) {
@@ -1658,16 +1674,7 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
if (old == rcu_access_pointer(known->pub.ies))
rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
- /* Assign beacon IEs to all sub entries */
- list_for_each_entry(bss, &known->hidden_list, hidden_list) {
- const struct cfg80211_bss_ies *ies;
-
- ies = rcu_access_pointer(bss->pub.beacon_ies);
- WARN_ON(ies != old);
-
- rcu_assign_pointer(bss->pub.beacon_ies,
- new->pub.beacon_ies);
- }
+ cfg80211_update_hidden_bsses(known, new->pub.beacon_ies, old);
if (old)
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
@@ -2360,6 +2367,8 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
} else {
old = rcu_access_pointer(nontrans_bss->beacon_ies);
rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
+ cfg80211_update_hidden_bsses(bss_from_pub(nontrans_bss),
+ new_ies, old);
rcu_assign_pointer(nontrans_bss->ies, new_ies);
if (old)
kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);