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linux-2.4.36: Commit

2.4.36-stable kernel tree

Commit MetaInfo

Revision226877eaab1eb1f15d43030d6662534478ab8d01 (tree)
Time2008-11-09 23:06:09
AuthorMarcel Sebek <sebek64@post...>
CommiterWilly Tarreau

Log Message

backport vlan device unregister fix


The attached patch was merged into 2.6.8 kernel, see


However, no similar fix is in 2.4. I've faced the problem on a
2.4.26 kernel (with external patches) and with DEBUG_SLAB turned on.
When I unregister network device with attached vlan device, the vlan
device structure is freed too early (because of wrong refcounting) and
dev_mc_discard call in unregister_netdevice uses this freed memmory,
which causes oops.

Signed-off-by: Marcel Šebek <sebek64@post.cz>

Change Summary

Incremental Difference

--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -635,7 +635,6 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
635635 ret = unregister_vlan_dev(dev,
636636 VLAN_DEV_INFO(vlandev)->vlan_id);
638- dev_put(vlandev);
639638 unregister_netdevice(vlandev);
641640 /* Group was destroyed? */
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