[PATCH net-next 08/13] ipv6: annotate data-races in rt6_probe()

[Eric Dumazet <edumazet@google.com>]

Use READ_ONCE() while reading idev->cnf.rtr_probe_interval
while its value could be changed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/ipv6/route.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6a2b53de48182525a923e62ba3fbd13cba60a48a..1b897c57c55fe22eff71a22b51ad25269db622f5 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -645,14 +645,15 @@ static void rt6_probe(struct fib6_nh *fib6_nh)
 		write_lock_bh(&neigh->lock);
 		if (!(neigh->nud_state & NUD_VALID) &&
 		    time_after(jiffies,
-			       neigh->updated + idev->cnf.rtr_probe_interval)) {
+			       neigh->updated +
+			       READ_ONCE(idev->cnf.rtr_probe_interval))) {
 			work = kmalloc(sizeof(*work), GFP_ATOMIC);
 			if (work)
 				__neigh_set_probe_once(neigh);
 		}
 		write_unlock_bh(&neigh->lock);
 	} else if (time_after(jiffies, last_probe +
-				       idev->cnf.rtr_probe_interval)) {
+				       READ_ONCE(idev->cnf.rtr_probe_interval))) {
 		work = kmalloc(sizeof(*work), GFP_ATOMIC);
 	}
 
-- 
2.44.0.rc1.240.g4c46232300-goog