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[GENETLINK]: Fix race in genl_unregister_mc_groups() 

family->mcast_groups is protected by genl_lock so it must
be held while accessing the list in genl_unregister_mc_groups().
Requires adding a non-locking variant of genl_unregister_mc_group().

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2007-07-24 15:32:46 -07:00 committed by David S. Miller
parent 85ccc365e9
commit 79dc4386ae
1 changed files with 16 additions and 8 deletions
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24
net/netlink/genetlink.c
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@ -200,6 +200,18 @@ int genl_register_mc_group(struct genl_family *family,
}
EXPORT_SYMBOL(genl_register_mc_group);
static void __genl_unregister_mc_group(struct genl_family *family,
struct genl_multicast_group *grp)
{
BUG_ON(grp->family != family);
netlink_clear_multicast_users(genl_sock, grp->id);
clear_bit(grp->id, mc_groups);
list_del(&grp->list);
genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, grp);
grp->id = 0;
grp->family = NULL;
}
/**
* genl_unregister_mc_group - unregister a multicast group
*
@ -217,14 +229,8 @@ EXPORT_SYMBOL(genl_register_mc_group);
void genl_unregister_mc_group(struct genl_family *family,
struct genl_multicast_group *grp)
{
BUG_ON(grp->family != family);
genl_lock();
netlink_clear_multicast_users(genl_sock, grp->id);
clear_bit(grp->id, mc_groups);
list_del(&grp->list);
genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, grp);
grp->id = 0;
grp->family = NULL;
__genl_unregister_mc_group(family, grp);
genl_unlock();
}
@ -232,8 +238,10 @@ static void genl_unregister_mc_groups(struct genl_family *family)
{
struct genl_multicast_group *grp, *tmp;
genl_lock();
list_for_each_entry_safe(grp, tmp, &family->mcast_groups, list)
genl_unregister_mc_group(family, grp);
__genl_unregister_mc_group(family, grp);
genl_unlock();
}
/**