lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <cb44ea91c0b7084079c3086d6d75e7984505cec7.1714660565.git.duoming@zju.edu.cn>
Date: Thu,  2 May 2024 22:43:38 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: linux-hams@...r.kernel.org
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jreuter@...na.de,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dan.carpenter@...aro.org,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH net 2/2] ax25: fix potential reference counting leak in ax25_addr_ax25dev

The reference counting of ax25_dev potentially increase more
than once in ax25_addr_ax25dev(), which will cause memory leak.

In order to fix the above issue, only increase the reference
counting of ax25_dev once, when the res is not null.

Fixes: d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
 net/ax25/ax25_dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
index 07723095c60..945af92a7b6 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -37,8 +37,9 @@ ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
 	for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
 		if (ax25cmp(addr, (const ax25_address *)ax25_dev->dev->dev_addr) == 0) {
 			res = ax25_dev;
-			ax25_dev_hold(ax25_dev);
 		}
+	if (res)
+		ax25_dev_hold(ax25_dev);
 	spin_unlock_bh(&ax25_dev_lock);
 
 	return res;
-- 
2.17.1


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ