netdev - Re: [PATCH v2] selftests/net: fix uninitialized variables

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Message-ID: <66392e41e6889_55f25294dc@willemb.c.googlers.com.notmuch>
Date: Mon, 06 May 2024 15:23:45 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: John Hubbard <jhubbard@...dia.com>, 
 Shuah Khan <shuah@...nel.org>
Cc: "David S . Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Steffen Klassert <steffen.klassert@...unet.com>, 
 Herbert Xu <herbert@...dor.apana.org.au>, 
 Andreas Färber <afaerber@...e.de>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Matthieu Baerts <matttbe@...nel.org>, 
 Mat Martineau <martineau@...nel.org>, 
 Geliang Tang <geliang@...nel.org>, 
 Pravin B Shelar <pshelar@....org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Alexander Mikhalitsyn <alexander@...alicyn.com>, 
 zhujun2 <zhujun2@...s.chinamobile.com>, 
 Petr Machata <petrm@...dia.com>, 
 Ido Schimmel <idosch@...dia.com>, 
 Hangbin Liu <liuhangbin@...il.com>, 
 Nikolay Aleksandrov <razor@...ckwall.org>, 
 Benjamin Poirier <bpoirier@...dia.com>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Dmitry Safonov <0x7f454c46@...il.com>, 
 netdev@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 linux-actions@...ts.infradead.org, 
 mptcp@...ts.linux.dev, 
 dev@...nvswitch.org, 
 Valentin Obst <kernel@...entinobst.de>, 
 linux-kselftest@...r.kernel.org, 
 LKML <linux-kernel@...r.kernel.org>, 
 llvm@...ts.linux.dev, 
 John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v2] selftests/net: fix uninitialized variables

John Hubbard wrote:
> When building with clang, via:
> 
>     make LLVM=1 -C tools/testing/selftest
> 
> ...clang warns about three variables that are not initialized in all
> cases:
> 
> 1) The opt_ipproto_off variable is used uninitialized if "testname" is
> not "ip". Willem de Bruijn pointed out that this is an actual bug, and
> suggested the fix that I'm using here (thanks!).
> 
> 2) The addr_len is used uninitialized, but only in the assert case,
>    which bails out, so this is harmless.
> 
> 3) The family variable in add_listener() is only used uninitialized in
>    the error case (neither IPv4 nor IPv6 is specified), so it's also
>    harmless.
> 
> Fix by initializing each variable.
> 
> Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>

Thanks!