linux-kernel - Re: [v2] RDMA/iwpm: Fix uninitialized error code in iwpm_send

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Message-ID: <20171213181939.GC5984@ziepe.ca>
Date:   Wed, 13 Dec 2017 11:19:39 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>,
        Roland Dreier <roland@...estorage.com>,
        Doug Ledford <dledford@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v2] RDMA/iwpm: Fix uninitialized error code in
 iwpm_send_mapinfo()

On Wed, Nov 29, 2017 at 09:47:33AM +0100, Geert Uytterhoeven wrote:
> With gcc-4.1.2:
> 
>     drivers/infiniband/core/iwpm_util.c: In function ‘iwpm_send_mapinfo’:
>     drivers/infiniband/core/iwpm_util.c:647: warning: ‘ret’ may be used uninitialized in this function
> 
> Indeed, if nl_client is not found in any of the scanned has buckets, ret
> will be used uninitialized.
> 
> Preinitialize ret to -EINVAL to fix this.
> 
> Fixes: 30dc5e63d6a5ad24 ("RDMA/core: Add support for iWARP Port Mapper user space service")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Reviewed-by: Tatyana Nikolova <tatyana.e.nikolova@...el.com>
> v2:
>   - Use -EINVAL instead of zero,
>   - Move the preinitialization to just before the loop, to catach future
>     early offenders,
>   - Drop RFC state.
>  drivers/infiniband/core/iwpm_util.c | 1 +
>  1 file changed, 1 insertion(+)

Thanks applied to -next.

Jason