linux-kernel - Re: [PATCH] netfilter: nf_flow_table_offload: Don't use offset uninitialized in flow_offload_port

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Message-ID: <20191129080432.jnsghajoenturr7v@salvia>
Date:   Fri, 29 Nov 2019 09:04:32 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] netfilter: nf_flow_table_offload: Don't use offset
 uninitialized in flow_offload_port_{d,s}nat

On Tue, Nov 26, 2019 at 01:12:26PM -0700, Nathan Chancellor wrote:
> Clang warns (trimmed the second warning for brevity):
> 
> ../net/netfilter/nf_flow_table_offload.c:342:2: warning: variable
> 'offset' is used uninitialized whenever switch default is taken
> [-Wsometimes-uninitialized]
>         default:
>         ^~~~~~~
> ../net/netfilter/nf_flow_table_offload.c:346:57: note: uninitialized use
> occurs here
>         flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
>                                                                ^~~~~~
> ../net/netfilter/nf_flow_table_offload.c:331:12: note: initialize the
> variable 'offset' to silence this warning
>         u32 offset;
>                   ^
>                    = 0
> 
> Match what was done in the flow_offload_ipv{4,6}_{d,s}nat functions and
> just return in the default case, since port would also be uninitialized.

Applied, thanks.