linux-kernel - [PATCH net-next v6 02/10] net: free

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: <20240411135952.1096696-3-leitao@debian.org>
Date: Thu, 11 Apr 2024 06:59:26 -0700
From: Breno Leitao <leitao@...ian.org>
To: aleksander.lobakin@...el.com,
	kuba@...nel.org,
	davem@...emloft.net,
	pabeni@...hat.com,
	edumazet@...gle.com,
	elder@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	nbd@....name,
	sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com,
	lorenzo@...nel.org,
	taras.chornyi@...ision.eu,
	ath11k@...ts.infradead.org,
	ath10k@...ts.infradead.org,
	linux-wireless@...r.kernel.org,
	geomatsi@...il.com,
	kvalo@...nel.org
Cc: quic_jjohnson@...cinc.com,
	leon@...nel.org,
	dennis.dalessandro@...nelisnetworks.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	idosch@...sch.org,
	leitao@...ian.org,
	Ido Schimmel <idosch@...dia.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Simon Horman <horms@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH net-next v6 02/10] net: free_netdev: exit earlier if dummy

For dummy devices, exit earlier at free_netdev() instead of executing
the whole function. This is necessary, because dummy devices are
special, and shouldn't have the second part of the function executed.

Otherwise reg_state, which is NETREG_DUMMY, will be overwritten and
there will be no way to identify that this is a dummy device. Also, this
device do not need the final put_device(), since dummy devices are not
registered (through register_netdevice()), where the device reference is
increased (at netdev_register_kobject()/device_add()).

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Breno Leitao <leitao@...ian.org>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---
 net/core/dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 987039ffa63c..c74b42bc6888 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11060,7 +11060,8 @@ void free_netdev(struct net_device *dev)
 	phy_link_topo_destroy(dev->link_topo);
 
 	/*  Compatibility with error handling in drivers */
-	if (dev->reg_state == NETREG_UNINITIALIZED) {
+	if (dev->reg_state == NETREG_UNINITIALIZED ||
+	    dev->reg_state == NETREG_DUMMY) {
 		netdev_freemem(dev);
 		return;
 	}
-- 
2.43.0