From: Pavel Emelyanov Date: Thu, 18 Oct 2007 12:14:58 +0000 (-0700) Subject: [IPV6]: Lost locking when inserting a flowlabel in ipv6_fl_list X-Git-Tag: v2.6.24-rc1~294^2~4 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04028045a12ba941c579d0f3238489333ac18ea4;p=linux-2.6 [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 Signed-off-by: David S. Miller --- diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index 217d60f9fc..8550df20f9 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -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: