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-rw-r--r--net/ipv4/inetpeer.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index be778599bfed..ff327a62c9ce 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -160,7 +160,12 @@ static void inet_peer_gc(struct inet_peer_base *base,
base->total / inet_peer_threshold * HZ;
for (i = 0; i < gc_cnt; i++) {
p = gc_stack[i];
- delta = (__u32)jiffies - p->dtime;
+
+ /* The READ_ONCE() pairs with the WRITE_ONCE()
+ * in inet_putpeer()
+ */
+ delta = (__u32)jiffies - READ_ONCE(p->dtime);
+
if (delta < ttl || !refcount_dec_if_one(&p->refcnt))
gc_stack[i] = NULL;
}
@@ -237,7 +242,10 @@ EXPORT_SYMBOL_GPL(inet_getpeer);
void inet_putpeer(struct inet_peer *p)
{
- p->dtime = (__u32)jiffies;
+ /* The WRITE_ONCE() pairs with itself (we run lockless)
+ * and the READ_ONCE() in inet_peer_gc()
+ */
+ WRITE_ONCE(p->dtime, (__u32)jiffies);
if (refcount_dec_and_test(&p->refcnt))
call_rcu(&p->rcu, inetpeer_free_rcu);