diff options
| -rw-r--r-- | net/wireless/core.c | 4 | ||||
| -rw-r--r-- | net/wireless/core.h | 2 | ||||
| -rw-r--r-- | net/wireless/scan.c | 21 |
3 files changed, 22 insertions, 5 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index 154e1e294cb9..9b157caa74fd 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -664,7 +664,7 @@ static void wdev_cleanup_work(struct work_struct *work) if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { rdev->scan_req->aborted = true; - ___cfg80211_scan_done(rdev); + ___cfg80211_scan_done(rdev, true); } cfg80211_unlock_rdev(rdev); @@ -755,6 +755,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, default: break; } + break; + case NETDEV_DOWN: dev_hold(dev); schedule_work(&wdev->cleanup_work); break; diff --git a/net/wireless/core.h b/net/wireless/core.h index f565432ae22f..68eaf340d613 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -370,7 +370,7 @@ void cfg80211_sme_scan_done(struct net_device *dev); void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len); void cfg80211_sme_disassoc(struct net_device *dev, int idx); void __cfg80211_scan_done(struct work_struct *wk); -void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev); +void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak); void cfg80211_upload_connect_keys(struct wireless_dev *wdev); struct ieee80211_channel * diff --git a/net/wireless/scan.c b/net/wireless/scan.c index fe575a24c95c..7043de6221ab 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -18,7 +18,7 @@ #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) -void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev) +void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) { struct cfg80211_scan_request *request; struct net_device *dev; @@ -26,8 +26,13 @@ void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev) union iwreq_data wrqu; #endif + ASSERT_RDEV_LOCK(rdev); + request = rdev->scan_req; + if (!request) + return; + dev = request->dev; /* @@ -53,7 +58,17 @@ void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev) dev_put(dev); rdev->scan_req = NULL; - kfree(request); + + /* + * OK. If this is invoked with "leak" then we can't + * free this ... but we've cleaned it up anyway. The + * driver failed to call the scan_done callback, so + * all bets are off, it might still be trying to use + * the scan request or not ... if it accesses the dev + * in there (it shouldn't anyway) then it may crash. + */ + if (!leak) + kfree(request); } void __cfg80211_scan_done(struct work_struct *wk) @@ -64,7 +79,7 @@ void __cfg80211_scan_done(struct work_struct *wk) scan_done_wk); cfg80211_lock_rdev(rdev); - ___cfg80211_scan_done(rdev); + ___cfg80211_scan_done(rdev, false); cfg80211_unlock_rdev(rdev); } |