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[IPV6]: Lost locking when inserting a flowlabel in ipv6_fl_list 

The new flowlabels should be inserted into the sock list
under the ip6_sk_fl_lock. This was lost in one place.

This list is naturally protected with the socket lock, but
the fl6_sock_lookup() is called without it, so another
protection is required.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-10-18 05:14:58 -07:00 committed by David S. Miller
parent 009e8c965f
commit 04028045a1
1 changed files with 12 additions and 8 deletions
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20
net/ipv6/ip6_flowlabel.c
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@ -409,6 +409,16 @@ static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
return 0;
}
static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
struct ip6_flowlabel *fl)
{
write_lock_bh(&ip6_sk_fl_lock);
sfl->fl = fl;
sfl->next = np->ipv6_fl_list;
np->ipv6_fl_list = sfl;
write_unlock_bh(&ip6_sk_fl_lock);
}
int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
{
int err;
@ -513,11 +523,7 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
fl1->linger = fl->linger;
if ((long)(fl->expires - fl1->expires) > 0)
fl1->expires = fl->expires;
write_lock_bh(&ip6_sk_fl_lock);
sfl1->fl = fl1;
sfl1->next = np->ipv6_fl_list;
np->ipv6_fl_list = sfl1;
write_unlock_bh(&ip6_sk_fl_lock);
fl_link(np, sfl1, fl1);
fl_free(fl);
return 0;
@ -545,9 +551,7 @@ release:
}
}
sfl1->fl = fl;
sfl1->next = np->ipv6_fl_list;
np->ipv6_fl_list = sfl1;
fl_link(np, sfl1, fl);
return 0;
default: