From 280ab987ef21d1c196acb3af4663a99f94d9da00 Mon Sep 17 00:00:00 2001 From: Lior David Date: Tue, 1 Mar 2016 19:18:14 +0200 Subject: [PATCH] wil6210: fix race conditions in p2p listen and search Fix 2 race conditions found during test runs of P2P discovery: 1. Because wil_p2p_cancel_listen was not protected, user space could start a new P2P listen/search before wmi_stop_discovery completed. This caused a crash in the firmware. 2. In P2P listen, when listen timer expires and user space calls cancel_remain_on_channel at the same time, code could send the cfg80211_remain_on_channel_expired notification twice. Added protections with wil->mutex to several places that call wmi_stop_discovery. Signed-off-by: Lior David Signed-off-by: Maya Erez Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/wil6210/cfg80211.c | 9 +++-- drivers/net/wireless/ath/wil6210/main.c | 2 +- drivers/net/wireless/ath/wil6210/p2p.c | 63 ++++++++++++++++++++--------- drivers/net/wireless/ath/wil6210/wil6210.h | 4 +- 4 files changed, 53 insertions(+), 25 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/cfg80211.c b/drivers/net/wireless/ath/wil6210/cfg80211.c index 24f9829..e867c76 100644 --- a/drivers/net/wireless/ath/wil6210/cfg80211.c +++ b/drivers/net/wireless/ath/wil6210/cfg80211.c @@ -387,7 +387,7 @@ static int wil_cfg80211_scan(struct wiphy *wiphy, return rc; } - wil_p2p_stop_discovery(wil); + (void)wil_p2p_stop_discovery(wil); wil_dbg_misc(wil, "Start scan_request 0x%p\n", request); wil_dbg_misc(wil, "SSID count: %d", request->n_ssids); @@ -868,6 +868,9 @@ static int wil_cfg80211_set_default_key(struct wiphy *wiphy, u8 key_index, bool unicast, bool multicast) { + struct wil6210_priv *wil = wiphy_to_wil(wiphy); + + wil_dbg_misc(wil, "%s: entered\n", __func__); return 0; } @@ -903,9 +906,7 @@ static int wil_cancel_remain_on_channel(struct wiphy *wiphy, wil_dbg_misc(wil, "%s()\n", __func__); - wil_p2p_cancel_listen(wil, cookie); - - return 0; + return wil_p2p_cancel_listen(wil, cookie); } /** diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c index e09e9bb..05a4ae7 100644 --- a/drivers/net/wireless/ath/wil6210/main.c +++ b/drivers/net/wireless/ath/wil6210/main.c @@ -984,7 +984,7 @@ int __wil_down(struct wil6210_priv *wil) } wil_enable_irq(wil); - wil_p2p_stop_discovery(wil); + (void)wil_p2p_stop_discovery(wil); if (wil->scan_request) { wil_dbg_misc(wil, "Abort scan_request 0x%p\n", diff --git a/drivers/net/wireless/ath/wil6210/p2p.c b/drivers/net/wireless/ath/wil6210/p2p.c index d223648..2c1b895 100644 --- a/drivers/net/wireless/ath/wil6210/p2p.c +++ b/drivers/net/wireless/ath/wil6210/p2p.c @@ -156,26 +156,42 @@ out: return rc; } -void wil_p2p_stop_discovery(struct wil6210_priv *wil) +u8 wil_p2p_stop_discovery(struct wil6210_priv *wil) { struct wil_p2p_info *p2p = &wil->p2p; + u8 started = p2p->discovery_started; if (p2p->discovery_started) { del_timer_sync(&p2p->discovery_timer); p2p->discovery_started = 0; wmi_stop_discovery(wil); } + + return started; } -void wil_p2p_cancel_listen(struct wil6210_priv *wil, u64 cookie) +int wil_p2p_cancel_listen(struct wil6210_priv *wil, u64 cookie) { struct wil_p2p_info *p2p = &wil->p2p; + u8 started; + + mutex_lock(&wil->mutex); - if (cookie != p2p->cookie) + if (cookie != p2p->cookie) { wil_info(wil, "%s: Cookie mismatch: 0x%016llx vs. 0x%016llx\n", __func__, p2p->cookie, cookie); + mutex_unlock(&wil->mutex); + return -ENOENT; + } + + started = wil_p2p_stop_discovery(wil); + + mutex_unlock(&wil->mutex); - wil_p2p_stop_discovery(wil); + if (!started) { + wil_err(wil, "%s: listen not started\n", __func__); + return -ENOENT; + } mutex_lock(&wil->p2p_wdev_mutex); cfg80211_remain_on_channel_expired(wil->radio_wdev, @@ -184,6 +200,7 @@ void wil_p2p_cancel_listen(struct wil6210_priv *wil, u64 cookie) GFP_KERNEL); wil->radio_wdev = wil->wdev; mutex_unlock(&wil->p2p_wdev_mutex); + return 0; } void wil_p2p_listen_expired(struct work_struct *work) @@ -192,18 +209,23 @@ void wil_p2p_listen_expired(struct work_struct *work) struct wil_p2p_info, discovery_expired_work); struct wil6210_priv *wil = container_of(p2p, struct wil6210_priv, p2p); + u8 started; wil_dbg_misc(wil, "%s()\n", __func__); - wil_p2p_stop_discovery(wil); + mutex_lock(&wil->mutex); + started = wil_p2p_stop_discovery(wil); + mutex_unlock(&wil->mutex); - mutex_lock(&wil->p2p_wdev_mutex); - cfg80211_remain_on_channel_expired(wil->radio_wdev, - p2p->cookie, - &p2p->listen_chan, - GFP_KERNEL); - wil->radio_wdev = wil->wdev; - mutex_unlock(&wil->p2p_wdev_mutex); + if (started) { + mutex_lock(&wil->p2p_wdev_mutex); + cfg80211_remain_on_channel_expired(wil->radio_wdev, + p2p->cookie, + &p2p->listen_chan, + GFP_KERNEL); + wil->radio_wdev = wil->wdev; + mutex_unlock(&wil->p2p_wdev_mutex); + } } @@ -213,14 +235,19 @@ void wil_p2p_search_expired(struct work_struct *work) struct wil_p2p_info, discovery_expired_work); struct wil6210_priv *wil = container_of(p2p, struct wil6210_priv, p2p); + u8 started; wil_dbg_misc(wil, "%s()\n", __func__); - wil_p2p_stop_discovery(wil); + mutex_lock(&wil->mutex); + started = wil_p2p_stop_discovery(wil); + mutex_unlock(&wil->mutex); - mutex_lock(&wil->p2p_wdev_mutex); - cfg80211_scan_done(wil->scan_request, 0); - wil->scan_request = NULL; - wil->radio_wdev = wil->wdev; - mutex_unlock(&wil->p2p_wdev_mutex); + if (started) { + mutex_lock(&wil->p2p_wdev_mutex); + cfg80211_scan_done(wil->scan_request, 0); + wil->scan_request = NULL; + wil->radio_wdev = wil->wdev; + mutex_unlock(&wil->p2p_wdev_mutex); + } } diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h index 9b77a08..68f60ea 100644 --- a/drivers/net/wireless/ath/wil6210/wil6210.h +++ b/drivers/net/wireless/ath/wil6210/wil6210.h @@ -775,8 +775,8 @@ int wil_p2p_search(struct wil6210_priv *wil, struct cfg80211_scan_request *request); int wil_p2p_listen(struct wil6210_priv *wil, unsigned int duration, struct ieee80211_channel *chan, u64 *cookie); -void wil_p2p_stop_discovery(struct wil6210_priv *wil); -void wil_p2p_cancel_listen(struct wil6210_priv *wil, u64 cookie); +u8 wil_p2p_stop_discovery(struct wil6210_priv *wil); +int wil_p2p_cancel_listen(struct wil6210_priv *wil, u64 cookie); void wil_p2p_listen_expired(struct work_struct *work); void wil_p2p_search_expired(struct work_struct *work); -- 2.7.4