From: Kuniyuki Iwashima <kuniyu@amazon.com> stable inclusion from stable-4.19.253 commit d93993b165243a0f614b946f417fbbb137b34ee2 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5I4FP CVE: NA -------------------------------- [ Upstream commit 1ebcb25ad6fc3d50fca87350acf451b9a66dd31e ] While reading sysctl_icmp_ratemask, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") 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> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- net/ipv4/icmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index fb3437beae29..10a5c7aa9c50 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -297,7 +297,7 @@ static bool icmpv4_mask_allow(struct net *net, int type, int code) return true; /* Limit if icmp type is enabled in ratemask. */ - if (!((1 << type) & net->ipv4.sysctl_icmp_ratemask)) + if (!((1 << type) & READ_ONCE(net->ipv4.sysctl_icmp_ratemask))) return true; return false; -- 2.25.1