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

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Date:   Fri, 21 Oct 2022 13:48:11 +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

Kalle Valo <kvalo@...nel.org> writes:

> 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.

Actually commit c888183b21f3 is in wireless-next so this patch should go
to wireless-next, for v6.2.

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