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| author | Florent Fourcot <florent.fourcot@enst-bretagne.fr> | 2013-11-07 20:53:14 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-08 22:44:15 +0400 |
| commit | 394055f6fabd077e74815865f01a73a31dd765d3 (patch) | |
| tree | f662d2d1206ef88cc47e97ac01d2f6f3dc6b8a67 | |
| parent | 53b47106c0c2b1f42237d255ae272f0fcc3ec413 (diff) | |
| download | linux-394055f6fabd077e74815865f01a73a31dd765d3.tar.xz | |
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>
| -rw-r--r-- | net/ipv6/ip6_flowlabel.c | 4 |
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; } |