netdev - Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87ilkdlq48.fsf@kernel.org>
Date:   Fri, 21 Oct 2022 08:09:27 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Jes Sorensen <Jes.Sorensen@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bitterblue Smith <rtl8821cerfe2@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] wifi: rtl8xxxu: Fix reads of uninitialized variables hw_ctrl_s1, sw_ctrl_s1

Colin Ian King <colin.i.king@...il.com> writes:

> Variables hw_ctrl_s1 and sw_ctrl_s1 are not being initialized and
> potentially can contain any garbage value. Currently there is an if
> statement that sets one or the other of these variables, followed
> by an if statement that checks if any of these variables have been
> set to a non-zero value. In the case where they may contain
> uninitialized non-zero values, the latter if statement may be
> taken as true when it was not expected to.
>
> Fix this by ensuring hw_ctrl_s1 and sw_ctrl_s1 are initialized.
>
> Cleans up clang warning:
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:7: warning:
> variable 'hw_ctrl_s1' is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
>                 if (hw_ctrl) {
>                     ^~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:440:7: note: uninitialized
> use occurs here
>                 if (hw_ctrl_s1 || sw_ctrl_s1) {
>                     ^~~~~~~~~~
> drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188f.c:432:3: note: remove the 'if'
> if its condition is always true
>                 if (hw_ctrl) {
>                 ^~~~~~~~~~~~~
>
> Fixes: c888183b21f3 ("wifi: rtl8xxxu: Support new chip RTL8188FU")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

I'll queue this to v6.1.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches