netdev - Re: [PATCH bpf-next v2] bpf: fix a (false) compiler warning

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Message-ID: <72e290be-9044-f6d3-f885-26a30d1e1957@iogearbox.net>
Date:   Thu, 17 Jan 2019 10:41:23 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Peter Oskolkov <posk@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org
Cc:     Peter Oskolkov <posk.devel@...il.com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH bpf-next v2] bpf: fix a (false) compiler warning

On 01/16/2019 07:43 PM, Peter Oskolkov wrote:
> An older GCC compiler complains:
> 
> kernel/bpf/verifier.c: In function 'bpf_check':
> kernel/bpf/verifier.c:4***:13: error: 'prev_offset' may be used uninitialized
>       in this function [-Werror=maybe-uninitialized]
>    } else if (krecord[i].insn_offset <= prev_offset) {
>              ^
> kernel/bpf/verifier.c:4***:38: note: 'prev_offset' was declared here
>   u32 i, nfuncs, urec_size, min_size, prev_offset;
> 
> Although the compiler is wrong here, the patch makes sure
> that prev_offset is always initialized, just to silence the warning.
> 
> v2: fix a spelling error in the commit message.
> 
> Signed-off-by: Peter Oskolkov <posk@...gle.com>

Applied, thanks!