From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Nicolas Iooss , Kalle Valo , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 15/67] rtlwifi: always initialize variables given to RT_TRACE() Date: Thu, 8 Mar 2018 04:57:38 +0000 Message-ID: <20180308045641.7814-15-alexander.levin@microsoft.com> References: <20180308045641.7814-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045641.7814-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Nicolas Iooss [ Upstream commit e4779162f7377baa9fb9a044555ecaae22c3f125 ] In rtl_rx_ampdu_apply(), when rtlpriv->cfg->ops->get_btc_status() returns false, RT_TRACE() is called with the values of variables reject_agg and agg_size, which have not been initialized. Always initialize these variables in order to prevent using uninitialized values. This issue has been found with clang. The compiler reported: drivers/net/wireless/realtek/rtlwifi/base.c:1665:6: error: variable 'agg_size' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] if (rtlpriv->cfg->ops->get_btc_status()) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/realtek/rtlwifi/base.c:1671:31: note: uninitialized use occurs here reject_agg, ctrl_agg_size, agg_size); ^~~~~~~~ drivers/net/wireless/realtek/rtlwifi/base.c:1665:6: error: variable 'reject_agg' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] if (rtlpriv->cfg->ops->get_btc_status()) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/realtek/rtlwifi/base.c:1671:4: note: uninitialized use occurs here reject_agg, ctrl_agg_size, agg_size); ^~~~~~~~~~ Fixes: 2635664e6e4a ("rtlwifi: Add rx ampdu cfg for btcoexist.") Signed-off-by: Nicolas Iooss Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtlwifi/base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wire= less/realtek/rtlwifi/base.c index ea18aa7afecb..93256f8bc0b5 100644 --- a/drivers/net/wireless/realtek/rtlwifi/base.c +++ b/drivers/net/wireless/realtek/rtlwifi/base.c @@ -1664,7 +1664,7 @@ int rtl_tx_agg_oper(struct ieee80211_hw *hw, void rtl_rx_ampdu_apply(struct rtl_priv *rtlpriv) { struct rtl_btc_ops *btc_ops =3D rtlpriv->btcoexist.btc_ops; - u8 reject_agg, ctrl_agg_size =3D 0, agg_size; + u8 reject_agg =3D 0, ctrl_agg_size =3D 0, agg_size =3D 0; =20 if (rtlpriv->cfg->ops->get_btc_status()) btc_ops->btc_get_ampdu_cfg(rtlpriv, &reject_agg, --=20 2.14.1