netdev - [PATCH 1/4] netlink: Improve exception handling in __netlink_kernel

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Message-ID: <477e5649-87e3-44d9-8226-010b9822e649@web.de>
Date: Sun, 31 Dec 2023 18:42:30 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Anjali Kulkarni <anjali.k.kulkarni@...cle.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Kuniyuki Iwashima <kuniyu@...zon.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] netlink: Improve exception handling in
 __netlink_kernel_create()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 31 Dec 2023 17:26:41 +0100

The kfree() function was called in one case by
the __netlink_kernel_create() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

Thus use another label.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 net/netlink/af_netlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 4ed8ffd58ff3..c3f88015cacf 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2042,7 +2042,7 @@ __netlink_kernel_create(struct net *net, int unit, struct module *module,

 	listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL);
 	if (!listeners)
-		goto out_sock_release;
+		goto out_netlink_release_sock;

 	sk->sk_data_ready = netlink_data_ready;
 	if (cfg && cfg->input)
@@ -2076,6 +2076,7 @@ __netlink_kernel_create(struct net *net, int unit, struct module *module,

 out_sock_release:
 	kfree(listeners);
+out_netlink_release_sock:
 	netlink_kernel_release(sk);
 	return NULL;

--
2.43.0