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net: vlan: avoid leaks on register_vlan_dev() failures 

[ Upstream commit 55b7ab1178cbf41f979ff83236d3321ad35ed2ad ]

VLAN checks for NETREG_UNINITIALIZED to distinguish between
registration failure and unregistration in progress.

Since commit cb626bf566eb ("net-sysfs: Fix reference count leak")
registration failure may, however, result in NETREG_UNREGISTERED
as well as NETREG_UNINITIALIZED.

This fix is similer to cebb69754f37 ("rtnetlink: Fix
memory(net_device) leak when ->newlink fails")

Fixes: cb626bf566eb ("net-sysfs: Fix reference count leak")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakub Kicinski 2020-12-30 19:40:27 -08:00 committed by Greg Kroah-Hartman
parent 4ff0737ebc
commit 37e6368a8d
1 changed files with 2 additions and 1 deletions
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3
net/8021q/vlan.c
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@ -280,7 +280,8 @@ static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
return 0;
out_free_newdev:
if (new_dev->reg_state == NETREG_UNINITIALIZED)
if (new_dev->reg_state == NETREG_UNINITIALIZED ||
new_dev->reg_state == NETREG_UNREGISTERED)
free_netdev(new_dev);
return err;
}