From bec568ff51078276109e21b5521829e2dd60a7fa Mon Sep 17 00:00:00 2001 From: Amitkumar Karwar Date: Thu, 14 Nov 2013 19:10:38 -0800 Subject: [PATCH] mwifiex: failure path handling in mwifiex_add_virtual_intf() 1) If register_netdevice() is failed, we are freeing netdev pointer, but priv->netdev is not cleared. This gives kernel paging request error when driver is unloaded or interface is deleted. Fix the problem by clearing the pointer. 2) Fix memory leak issue by freeing 'wdev' in failure paths. Also, clear priv->wdev pointer. As mwifiex_add_virtual_intf() successfully handles the failure conditions, redundant code under err_add_intf label is removed in this patch. Reported-by: Ujjal Roy Signed-off-by: Amitkumar Karwar Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/cfg80211.c | 20 ++++++++++++++++---- drivers/net/wireless/mwifiex/main.c | 13 ++----------- 2 files changed, 18 insertions(+), 15 deletions(-) diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c index fbad00a5abc8..ccc9c0866b25 100644 --- a/drivers/net/wireless/mwifiex/cfg80211.c +++ b/drivers/net/wireless/mwifiex/cfg80211.c @@ -2210,8 +2210,10 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy, priv->bss_started = 0; priv->bss_num = 0; - if (mwifiex_cfg80211_init_p2p_client(priv)) - return ERR_PTR(-EFAULT); + if (mwifiex_cfg80211_init_p2p_client(priv)) { + wdev = ERR_PTR(-EFAULT); + goto done; + } break; default: @@ -2224,7 +2226,8 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy, if (!dev) { wiphy_err(wiphy, "no memory available for netdevice\n"); priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED; - return ERR_PTR(-ENOMEM); + wdev = ERR_PTR(-ENOMEM); + goto done; } mwifiex_init_priv_params(priv, dev); @@ -2264,7 +2267,9 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy, wiphy_err(wiphy, "cannot register virtual network device\n"); free_netdev(dev); priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED; - return ERR_PTR(-EFAULT); + priv->netdev = NULL; + wdev = ERR_PTR(-EFAULT); + goto done; } sema_init(&priv->async_sem, 1); @@ -2274,6 +2279,13 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy, #ifdef CONFIG_DEBUG_FS mwifiex_dev_debugfs_init(priv); #endif + +done: + if (IS_ERR(wdev)) { + kfree(priv->wdev); + priv->wdev = NULL; + } + return wdev; } EXPORT_SYMBOL_GPL(mwifiex_add_virtual_intf); diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c index 7c7da3ea55a9..9236b42007fb 100644 --- a/drivers/net/wireless/mwifiex/main.c +++ b/drivers/net/wireless/mwifiex/main.c @@ -411,7 +411,7 @@ static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter) */ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) { - int ret, i; + int ret; char fmt[64]; struct mwifiex_private *priv; struct mwifiex_adapter *adapter = context; @@ -479,6 +479,7 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) NL80211_IFTYPE_STATION, NULL, NULL); if (IS_ERR(wdev)) { dev_err(adapter->dev, "cannot create default STA interface\n"); + rtnl_unlock(); goto err_add_intf; } rtnl_unlock(); @@ -488,16 +489,6 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context) goto done; err_add_intf: - for (i = 0; i < adapter->priv_num; i++) { - priv = adapter->priv[i]; - - if (!priv) - continue; - - if (priv->wdev && priv->netdev) - mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev); - } - rtnl_unlock(); err_register_cfg80211: wiphy_unregister(adapter->wiphy); wiphy_free(adapter->wiphy); -- 2.20.1