netdev - Re: [PATCH bpf v4 1/2] bpf, sockmap: fix potential memory leak on unlikely error case

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Date:   Tue, 13 Jul 2021 17:35:11 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf v4 1/2] bpf, sockmap: fix potential memory leak on
 unlikely error case

On Mon, Jul 12, 2021 at 12:56 PM John Fastabend
<john.fastabend@...il.com> wrote:
>
> If skb_linearize is needed and fails we could leak a msg on the error
> handling. To fix ensure we kfree the msg block before returning error.
> Found during code review.
>
> Fixes: 4363023d2668e ("bpf, sockmap: Avoid failures from skb_to_sgvec when skb has frag_list")
> Signed-off-by: John Fastabend <john.fastabend@...il.com>

Reviewed-by: Cong Wang <cong.wang@...edance.com>

Thanks for the update.