netdev - Re: [PATCH bpf 1/2] libbpf: fix invalid munmap call

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Message-ID: <CALDO+SZbD7rXj1rPdZui5OByp-6RXADQpkzq5vXcaqLEK+YuQQ@mail.gmail.com>
Date:   Tue, 30 Apr 2019 20:36:13 -0700
From:   William Tu <u9012063@...il.com>
To:     bpf@...r.kernel.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf 1/2] libbpf: fix invalid munmap call

On Tue, Apr 30, 2019 at 5:46 AM Björn Töpel <bjorn.topel@...il.com> wrote:
>
> From: Björn Töpel <bjorn.topel@...el.com>
>
> When unmapping the AF_XDP memory regions used for the rings, an
> invalid address was passed to the munmap() calls. Instead of passing
> the beginning of the memory region, the descriptor region was passed
> to munmap.
>
> When the userspace application tried to tear down an AF_XDP socket,
> the operation failed and the application would still have a reference
> to socket it wished to get rid of.
>
> Reported-by: William Tu <u9012063@...il.com>
> Fixes: 1cad07884239 ("libbpf: add support for using AF_XDP sockets")
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
> ---
Thank you.
Tested-by: William Tu <u9012063@...il.com>