linux-kernel - Re: [PATCH 1/1] apparmor: avoid per-cpu hold underflow in aa_get

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Message-ID: <0fa0e263-da74-43f2-9c2e-c61801e0d3ac@canonical.com>
Date: Mon, 19 Jan 2026 15:56:31 -0800
From: John Johansen <john.johansen@...onical.com>
To: Zhengmian Hu <huzhengmian@...il.com>, john@...armor.net,
 apparmor@...ts.ubuntu.com
Cc: linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] apparmor: avoid per-cpu hold underflow in
 aa_get_buffer

On 1/19/26 04:21, Zhengmian Hu wrote:
> Signed-off-by: Zhengmian Hu <huzhengmian@...il.com>

Small nit, there is no patch description. I can pull that from patch [0/1] if you are okay with that, otherwise can you send in a v2?

I will pull this in once I know your preference


> ---
>   security/apparmor/lsm.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index 9b6c2f157..a6c884ba6 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -1868,7 +1868,8 @@ char *aa_get_buffer(bool in_atomic)
>   	if (!list_empty(&cache->head)) {
>   		aa_buf = list_first_entry(&cache->head, union aa_buffer, list);
>   		list_del(&aa_buf->list);
> -		cache->hold--;
> +		if (cache->hold)
> +			cache->hold--;
>   		cache->count--;
>   		put_cpu_ptr(&aa_local_buffers);
>   		return &aa_buf->buffer[0];