From: Zhengmian Hu <huzhengmian@gmail.com>
To: john.johansen@canonical.com, john@apparmor.net,
apparmor@lists.ubuntu.com
Cc: linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
Zhengmian Hu <huzhengmian@gmail.com>
Subject: [PATCH 1/1] apparmor: avoid per-cpu hold underflow in aa_get_buffer
Date: Mon, 19 Jan 2026 07:21:19 -0500 [thread overview]
Message-ID: <20260119122119.3648154-2-huzhengmian@gmail.com> (raw)
In-Reply-To: <20260119122119.3648154-1-huzhengmian@gmail.com>
Signed-off-by: Zhengmian Hu <huzhengmian@gmail.com>
---
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];
--
2.52.0
next prev parent reply other threads:[~2026-01-19 12:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-19 12:21 [PATCH 0/1] apparmor: avoid per-cpu hold underflow in aa_get_buffer Zhengmian Hu
2026-01-19 12:21 ` Zhengmian Hu [this message]
2026-01-19 23:56 ` [PATCH 1/1] " John Johansen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260119122119.3648154-2-huzhengmian@gmail.com \
--to=huzhengmian@gmail.com \
--cc=apparmor@lists.ubuntu.com \
--cc=john.johansen@canonical.com \
--cc=john@apparmor.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox