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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-12 03:15:33 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-07-21 22:20:10 +0300
commita51040d4b120f3520df64fb0b9c63b31d69bea9b (patch)
tree92bb629fb06f462bcf654e40ebf049fe83e5f7ea /net/ipv6/route.c
parent2c56958de89b9a2efdb19310e3f11a6b97254d39 (diff)
downloadlinux-a51040d4b120f3520df64fb0b9c63b31d69bea9b.tar.xz
nexthop: Fix data-races around nexthop_compat_mode.
[ Upstream commit bdf00bf24bef9be1ca641a6390fd5487873e0d2e ] While reading nexthop_compat_mode, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 4f80116d3df3 ("net: ipv4: add sysctl for nexthop api compatibility mode") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e67505c6d856..cdf215442d37 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -5641,7 +5641,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
if (nexthop_is_blackhole(rt->nh))
rtm->rtm_type = RTN_BLACKHOLE;
- if (net->ipv4.sysctl_nexthop_compat_mode &&
+ if (READ_ONCE(net->ipv4.sysctl_nexthop_compat_mode) &&
rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
goto nla_put_failure;