From: Larry Finger <Larry.Finger@lwfinger.net>
To: Nicolas Iooss <nicolas.iooss_linux@m4x.org>,
Chaoming Li <chaoming_li@realsil.com.cn>,
Kalle Valo <kvalo@codeaurora.org>,
linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] rtlwifi: always initialize variables given to RT_TRACE()
Date: Mon, 11 Dec 2017 11:34:59 -0600 [thread overview]
Message-ID: <20ca7de6-f99e-1c61-4157-c7ab32e85406@lwfinger.net> (raw)
In-Reply-To: <20171210195159.7454-1-nicolas.iooss_linux@m4x.org>
On 12/10/2017 01:51 PM, Nicolas Iooss wrote:
> 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 <nicolas.iooss_linux@m4x.org>
Looks good. Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Thanks,
Larry
> ---
> 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/wireless/realtek/rtlwifi/base.c
> index cad2272ae21b..704741d6f495 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/base.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/base.c
> @@ -1726,7 +1726,7 @@ int rtl_tx_agg_oper(struct ieee80211_hw *hw,
> void rtl_rx_ampdu_apply(struct rtl_priv *rtlpriv)
> {
> struct rtl_btc_ops *btc_ops = rtlpriv->btcoexist.btc_ops;
> - u8 reject_agg, ctrl_agg_size = 0, agg_size;
> + u8 reject_agg = 0, ctrl_agg_size = 0, agg_size = 0;
>
> if (rtlpriv->cfg->ops->get_btc_status())
> btc_ops->btc_get_ampdu_cfg(rtlpriv, &reject_agg,
>
next prev parent reply other threads:[~2017-12-11 17:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-10 19:51 [PATCH 1/1] rtlwifi: always initialize variables given to RT_TRACE() Nicolas Iooss
2017-12-11 17:34 ` Larry Finger [this message]
2017-12-14 12:44 ` [1/1] " Kalle Valo
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