linux-kernel - Re: [PATCH AUTOSEL 4.18 39/65] fs/cifs: suppress a string overflow warning

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Message-ID: <20181001112246.4dcbc4fd@canb.auug.org.au>
Date:   Mon, 1 Oct 2018 11:22:46 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steven French <Steven.French@...rosoft.com>
Subject: Re: [PATCH AUTOSEL 4.18 39/65] fs/cifs: suppress a string overflow
 warning

Hi Sasha,

On Mon, 1 Oct 2018 00:38:27 +0000 Sasha Levin <Alexander.Levin@...rosoft.com> wrote:
>
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> 
> [ Upstream commit bcfb84a996f6fa90b5e6e2954b2accb7a4711097 ]
> 
> A powerpc build of cifs with gcc v8.2.0 produces this warning:
> 
> fs/cifs/cifssmb.c: In function ‘CIFSSMBNegotiate’:
> fs/cifs/cifssmb.c:605:3: warning: ‘strncpy’ writing 16 bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
>    strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Since we are already doing a strlen() on the source, change the strncpy
> to a memcpy().
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Steve French <stfrench@...rosoft.com>
> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>

Just wondering if this should be included as it only fixes a build
warning, there is no actual bug.  Same for the 4.9 and 4.14 versions.

-- 
Cheers,
Stephen Rothwell

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