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authorFlorent Fourcot <florent.fourcot@enst-bretagne.fr>2013-11-07 17:53:14 +0100
committerDavid S. Miller <davem@davemloft.net>2013-11-08 19:44:15 +0100
commit394055f6fabd077e74815865f01a73a31dd765d3 (patch)
treef662d2d1206ef88cc47e97ac01d2f6f3dc6b8a67 /net
parentipv6: increase maximum lifetime of flow labels (diff)
downloadlinux-394055f6fabd077e74815865f01a73a31dd765d3.tar.xz
linux-394055f6fabd077e74815865f01a73a31dd765d3.zip
ipv6: protect flow label renew against GC
Take ip6_fl_lock before to read and update a label. v2: protect only the relevant code Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_flowlabel.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 5f10b0d0bca5..98fdcc6f51b1 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -345,6 +345,8 @@ static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned lo
expires = check_linger(expires);
if (!expires)
return -EPERM;
+
+ spin_lock_bh(&ip6_fl_lock);
fl->lastuse = jiffies;
if (time_before(fl->linger, linger))
fl->linger = linger;
@@ -352,6 +354,8 @@ static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned lo
expires = fl->linger;
if (time_before(fl->expires, fl->lastuse + expires))
fl->expires = fl->lastuse + expires;
+ spin_unlock_bh(&ip6_fl_lock);
+
return 0;
}