Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:40640 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755146AbeCWKGA (ORCPT ); Fri, 23 Mar 2018 06:06:00 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Brian Norris , Kalle Valo , Sasha Levin Subject: [PATCH 4.9 034/177] mwifiex: dont leak chan_stats on reset Date: Fri, 23 Mar 2018 10:52:42 +0100 Message-Id: <20180323094206.669962569@linuxfoundation.org> In-Reply-To: <20180323094205.090519271@linuxfoundation.org> References: <20180323094205.090519271@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Brian Norris [ Upstream commit fb9e67bee3ab7111513130c516ffe378d885c0d0 ] 'chan_stats' is (re)allocated in _mwifiex_fw_dpc() -> mwifiex_init_channel_scan_gap(), which is called whenever the device is initialized -- at probe or at reset. But we only free it in we completely unregister the adapter, meaning we leak a copy of it during every reset. Let's free it in the shutdown / removal paths instead (and in the error-handling path), to avoid the leak. Ideally, we can eventually unify much of mwifiex_shutdown_sw() and mwifiex_remove_card() (way too much copy-and-paste) to reduce the burden on bugfixes like this. But that's work for tomorrow. Signed-off-by: Brian Norris Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/marvell/mwifiex/main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/net/wireless/marvell/mwifiex/main.c +++ b/drivers/net/wireless/marvell/mwifiex/main.c @@ -146,7 +146,6 @@ static int mwifiex_unregister(struct mwi kfree(adapter->regd); - vfree(adapter->chan_stats); kfree(adapter); return 0; } @@ -636,6 +635,7 @@ static void mwifiex_fw_dpc(const struct goto done; err_add_intf: + vfree(adapter->chan_stats); wiphy_unregister(adapter->wiphy); wiphy_free(adapter->wiphy); err_init_fw: @@ -1429,6 +1429,7 @@ mwifiex_shutdown_sw(struct mwifiex_adapt mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev); rtnl_unlock(); } + vfree(adapter->chan_stats); up(sem); exit_sem_err: @@ -1729,6 +1730,7 @@ int mwifiex_remove_card(struct mwifiex_a mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev); rtnl_unlock(); } + vfree(adapter->chan_stats); wiphy_unregister(adapter->wiphy); wiphy_free(adapter->wiphy);