netdev - Re: [PATCH v1 net-next] selftest/net: Fix uninit val warning in tcp

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Date:   Wed, 5 Apr 2023 08:25:51 -0700
From:   Kuniyuki Iwashima <kuniyu@...zon.com>
To:     <edumazet@...gle.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <kuni1840@...il.com>,
        <kuniyu@...zon.com>, <lixiaoyan@...gle.com>,
        <netdev@...r.kernel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH v1 net-next] selftest/net: Fix uninit val warning in tcp_mmap.c.

From:   Eric Dumazet <edumazet@...gle.com>
Date:   Wed, 5 Apr 2023 09:05:38 +0200
> On Wed, Apr 5, 2023 at 4:33 AM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
> >
> > Commit 5c5945dc695c ("selftests/net: Add SHA256 computation over data
> > sent in tcp_mmap") forgot to initialise a local var.
> >
> >   $ make -s -C tools/testing/selftests/net
> >   tcp_mmap.c: In function ‘child_thread’:
> >   tcp_mmap.c:211:61: warning: ‘lu’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> >     211 |                         zc.length = min(chunk_size, FILE_SZ - lu);
> >         |                                                             ^
> >
> > Fixes: 5c5945dc695c ("selftests/net: Add SHA256 computation over data sent in tcp_mmap")
> > Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> > ---
> > Note that the cited commit is not merged in net.git.
> > ---
> >  tools/testing/selftests/net/tcp_mmap.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c
> > index 607cc9ad8d1b..1056e37f4d98 100644
> > --- a/tools/testing/selftests/net/tcp_mmap.c
> > +++ b/tools/testing/selftests/net/tcp_mmap.c
> > @@ -168,7 +168,7 @@ void *child_thread(void *arg)
> >         double throughput;
> >         struct rusage ru;
> >         size_t buffer_sz;
> > -       int lu, fd;
> > +       int lu = 0, fd;
> >
> >         fd = (int)(unsigned long)arg;
> >
> > --
> > 2.30.2
> >
> 
> This is not the right fix. I sent it yesterday, not sure if you have seen it ?

Yes, I missed that.
Sorry for noise and thank you for your fix!