linux-kernel - Re: [PATCH v1] selftests/xsk: Avoid use-after-free on ctx

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Date:   Fri, 02 Sep 2022 14:00:15 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Ian Rogers <irogers@...gle.com>
Cc:     bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, jonathan.lemon@...il.com,
        ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, mykolal@...com,
        shuah@...nel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] selftests/xsk: Avoid use-after-free on ctx

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Thu,  1 Sep 2022 13:26:45 -0700 you wrote:
> The put lowers the reference count to 0 and frees ctx, reading it
> afterwards is invalid. Move the put after the uses and determine the
> last use by the reference count being 1.
> 
> Fixes: 39e940d4abfa ("selftests/xsk: Destroy BPF resources only when ctx refcount drops to 0")
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> [...]

Here is the summary with links:
  - [v1] selftests/xsk: Avoid use-after-free on ctx
    https://git.kernel.org/bpf/bpf-next/c/af515a5587b8

You are awesome, thank you!
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