diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-12 03:15:25 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-13 14:56:49 +0300 |
| commit | b04f9b7e85c7d7aecbada620e8759a662af068d3 (patch) | |
| tree | 458781f1c16bfdd15f17fbacc2f2226ee4b7fadb /net | |
| parent | 66484bb98ed2dfa1dda37a32411483d8311ac269 (diff) | |
| download | linux-b04f9b7e85c7d7aecbada620e8759a662af068d3.tar.xz | |
icmp: Fix a data-race around sysctl_icmp_ignore_bogus_error_responses.
While reading sysctl_icmp_ignore_bogus_error_responses, 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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/icmp.c | 2 | ||||
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 4b1d84d3feaa..0c01696c5584 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -933,7 +933,7 @@ static enum skb_drop_reason icmp_unreach(struct sk_buff *skb) * get the other vendor to fix their kit. */ - if (!net->ipv4.sysctl_icmp_ignore_bogus_error_responses && + if (!READ_ONCE(net->ipv4.sysctl_icmp_ignore_bogus_error_responses) && inet_addr_type_dev_table(net, skb->dev, iph->daddr) == RTN_BROADCAST) { net_warn_ratelimited("%pI4 sent an invalid ICMP type %u, code %u error to a broadcast: %pI4 on %s\n", &ip_hdr(skb)->saddr, diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index cb53476a292e..3122e652f3c3 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -626,6 +626,8 @@ static struct ctl_table ipv4_net_table[] = { .maxlen = sizeof(u8), .mode = 0644, .proc_handler = proc_dou8vec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE }, { .procname = "icmp_errors_use_inbound_ifaddr", |