From: Kuniyuki Iwashima kuniyu@amazon.com
[ Upstream commit 4a2f7083cc6cb72dade9a63699ca352fad26d1cd ]
While reading sysctl_icmp_echo_enable_probe, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers.
Fixes: d329ea5bd884 ("icmp: add response to RFC 8335 PROBE messages") Fixes: 1fd07f33c3ea ("ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages") 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 --- net/ipv4/icmp.c | 2 +- net/ipv6/icmp.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 92eaa96a9ff1..7edc8a3b1646 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -1025,7 +1025,7 @@ bool icmp_build_probe(struct sk_buff *skb, struct icmphdr *icmphdr) u16 ident_len; u8 status;
- if (!net->ipv4.sysctl_icmp_echo_enable_probe) + if (!READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) return false;
/* We currently only support probing interfaces on the proxy node diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index e6b978ea0e87..26554aa6fc1b 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -919,7 +919,7 @@ static int icmpv6_rcv(struct sk_buff *skb) break; case ICMPV6_EXT_ECHO_REQUEST: if (!net->ipv6.sysctl.icmpv6_echo_ignore_all && - net->ipv4.sysctl_icmp_echo_enable_probe) + READ_ONCE(net->ipv4.sysctl_icmp_echo_enable_probe)) icmpv6_echo_reply(skb); break;