Return-path: Received: from plane.gmane.org ([80.91.229.3]:46023 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932452Ab3LEOAL (ORCPT ); Thu, 5 Dec 2013 09:00:11 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1VoZTI-0002H6-L2 for linux-wireless@vger.kernel.org; Thu, 05 Dec 2013 15:00:04 +0100 Received: from gw.alumnux.com ([121.243.14.254]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 05 Dec 2013 15:00:04 +0100 Received: from royujjal by gw.alumnux.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 05 Dec 2013 15:00:04 +0100 To: linux-wireless@vger.kernel.org From: Ujjal Roy Subject: Re: [PATCH v2] cfg80211: fix =?utf-8?b?V0FSTl9PTg==?= for re-association to the expired BSS Date: Thu, 5 Dec 2013 13:51:02 +0000 (UTC) Message-ID: (sfid-20131205_150018_406122_FEF13CCB) References: <1385883096-7143-1-git-send-email-royujjal@gmail.com> (sfid-20131201_083145_260096_779C94CC) <1386081014.4393.31.camel@jlt4.sipsolutions.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: Johannes Berg writes: > In an unsuccessful result case, this leaks the BSS struct. I'd prefer to > reshuffle the code a bit to not need a separate save_bss variable, but I > don't immediately see an easy way to do that. > > johannes > Thanks for pointing out the issue. The modified patch is here. --- cfg80211 allows re-association in managed mode and if a user wants to re-associate to the same AP network after the time period of IEEE80211_SCAN_RESULT_EXPIRE, cfg80211 warns with the following message on receiving the connect result event. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 13984 at net/wireless/sme.c:658 __cfg80211_connect_result+0x3a6/0x3e0 [cfg80211]() Call Trace: [] dump_stack+0x46/0x58 [] warn_slowpath_common+0x87/0xb0 [] warn_slowpath_null+0x15/0x20 [] __cfg80211_connect_result+0x3a6/0x3e0 [cfg80211] [] ? update_rq_clock+0x2b/0x50 [] ? update_curr+0x1/0x160 [] cfg80211_process_wdev_events+0xb2/0x1c0 [cfg80211] [] ? pick_next_task_fair+0x63/0x170 [] cfg80211_process_rdev_events+0x38/0x90 [cfg80211] [] cfg80211_event_work+0x1d/0x30 [cfg80211] [] process_one_work+0x17f/0x420 [] worker_thread+0x11a/0x370 [] ? rescuer_thread+0x2f0/0x2f0 [] kthread+0xbb/0xc0 [] ? kthread_create_on_node+0x120/0x120 [] ret_from_fork+0x7c/0xb0 [] ? kthread_create_on_node+0x120/0x120 ---[ end trace 61f3bddc9c4981f7 ]--- The reason is that, in connect result event cfg80211 unholds the BSS to which the device is associated (and was held so far). So, for the event with status successful, when cfg80211 wants to get that BSS from the device's BSS list it gets a NULL BSS because the BSS has been expired and unheld already. Fix it by reshuffling the code. Signed-off-by: Ujjal Roy --- net/wireless/sme.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/net/wireless/sme.c b/net/wireless/sme.c index 65f8008..d3c5bd7 100644 --- a/net/wireless/sme.c +++ b/net/wireless/sme.c @@ -632,6 +632,16 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid, } #endif + if (!bss && (status == WLAN_STATUS_SUCCESS)) { + WARN_ON_ONCE(!wiphy_to_dev(wdev->wiphy)->ops->connect); + bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid, + wdev->ssid, wdev->ssid_len, + WLAN_CAPABILITY_ESS, + WLAN_CAPABILITY_ESS); + if (bss) + cfg80211_hold_bss(bss_from_pub(bss)); + } + if (wdev->current_bss) { cfg80211_unhold_bss(wdev->current_bss); cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); @@ -649,16 +659,8 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid, return; } - if (!bss) { - WARN_ON_ONCE(!wiphy_to_dev(wdev->wiphy)->ops->connect); - bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid, - wdev->ssid, wdev->ssid_len, - WLAN_CAPABILITY_ESS, - WLAN_CAPABILITY_ESS); - if (WARN_ON(!bss)) - return; - cfg80211_hold_bss(bss_from_pub(bss)); - } + if (WARN_ON(!bss)) + return; wdev->current_bss = bss_from_pub(bss); -- 1.8.1.4 > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majordomo@... > More majordomo info at http://vger.kernel.org/majordomo-info.html > >