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Date:   Sat, 13 Oct 2018 23:04:44 -0700
From:   Alexei Starovoitov <>
To:     Joe Stringer <>
Subject: Re: [PATCH bpf-next] bpf: Fix dev pointer dereference from sk_skb

On Fri, Oct 12, 2018 at 02:50:53PM -0700, Joe Stringer wrote:
> Dan Carpenter reports:
> The patch 6acc9b432e67: "bpf: Add helper to retrieve socket in BPF"
> from Oct 2, 2018, leads to the following Smatch complaint:
>     net/core/filter.c:4893 bpf_sk_lookup()
>     error: we previously assumed 'skb->dev' could be null (see line 4885)
> Fix this issue by checking skb->dev before using it.
> Signed-off-by: Joe Stringer <>

Applied, Thanks

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