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Subject: Re: [PATCH bpf-next v2] libbpf: Add a check to ensure that page_cnt is
 non-zero
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <164632141038.18423.8019591299586086867.git-patchwork-notify@kernel.org>
Date:   Thu, 03 Mar 2022 15:30:10 +0000
References: <20220303005921.53436-1-ytcoode@gmail.com>
In-Reply-To: <20220303005921.53436-1-ytcoode@gmail.com>
To:     Yuntao Wang <ytcoode@gmail.com>
Cc:     andrii.nakryiko@gmail.com, andrii@kernel.org, ast@kernel.org,
        bpf@vger.kernel.org, daniel@iogearbox.net,
        john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        songliubraving@fb.com, yhs@fb.com
Precedence: bulk

Hello:

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

On Thu,  3 Mar 2022 08:59:21 +0800 you wrote:
> The page_cnt parameter is used to specify the number of memory pages
> allocated for each per-CPU buffer, it must be non-zero and a power of 2.
> 
> Currently, the __perf_buffer__new() function attempts to validate that
> the page_cnt is a power of 2 but forgets checking for the case where
> page_cnt is zero, we can fix it by replacing 'page_cnt & (page_cnt - 1)'
> with 'page_cnt == 0 || (page_cnt & (page_cnt - 1))'.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2] libbpf: Add a check to ensure that page_cnt is non-zero
    https://git.kernel.org/bpf/bpf-next/c/41332d6e3a43

You are awesome, thank you!
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