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nl80211: take RCU read lock when calling ieee80211_bss_get_ie()
As ieee80211_bss_get_ie() derefences an RCU to return ssid_ie, both
the call to this function and any operation on this variable need
protection by the RCU read lock.
Fixes: 44905265bc
("nl80211: don't expose wdev->ssid for most interfaces")
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
parent
a48a52b7be
commit
7a94b8c2ee
1 changed files with 7 additions and 4 deletions
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@ -2618,12 +2618,13 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
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const u8 *ssid_ie;
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const u8 *ssid_ie;
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if (!wdev->current_bss)
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if (!wdev->current_bss)
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break;
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break;
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rcu_read_lock();
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ssid_ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
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ssid_ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
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WLAN_EID_SSID);
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WLAN_EID_SSID);
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if (!ssid_ie)
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if (ssid_ie &&
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break;
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nla_put(msg, NL80211_ATTR_SSID, ssid_ie[1], ssid_ie + 2))
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if (nla_put(msg, NL80211_ATTR_SSID, ssid_ie[1], ssid_ie + 2))
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goto nla_put_failure_rcu_locked;
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goto nla_put_failure_locked;
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rcu_read_unlock();
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break;
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break;
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}
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}
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default:
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default:
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@ -2635,6 +2636,8 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
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genlmsg_end(msg, hdr);
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genlmsg_end(msg, hdr);
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return 0;
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return 0;
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nla_put_failure_rcu_locked:
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rcu_read_unlock();
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nla_put_failure_locked:
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nla_put_failure_locked:
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wdev_unlock(wdev);
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wdev_unlock(wdev);
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nla_put_failure:
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nla_put_failure:
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