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ipvs: add READ_ONCE barrier for ipvs->sysctl_amemthresh

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Cc: Julian Anastasov <ja@ssi.bg>
Cc: Simon Horman <horms@verge.net.au>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Cc: Florian Westphal <fw@strlen.de>
Suggested-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Mikhalitsyn 2024-05-06 16:14:43 +02:00 committed by David S. Miller
parent abb45a2477
commit 643bb5dbae
1 changed files with 7 additions and 7 deletions
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14
net/netfilter/ipvs/ip_vs_ctl.c
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@ -94,6 +94,7 @@ static void update_defense_level(struct netns_ipvs *ipvs)
{
struct sysinfo i;
int availmem;
int amemthresh;
int nomem;
int to_change = -1;
@ -105,7 +106,8 @@ static void update_defense_level(struct netns_ipvs *ipvs)
/* si_swapinfo(&i); */
/* availmem = availmem - (i.totalswap - i.freeswap); */
nomem = (availmem < ipvs->sysctl_amemthresh);
amemthresh = max(READ_ONCE(ipvs->sysctl_amemthresh), 0);
nomem = (availmem < amemthresh);
local_bh_disable();
@ -145,9 +147,8 @@ static void update_defense_level(struct netns_ipvs *ipvs)
break;
case 1:
if (nomem) {
ipvs->drop_rate = ipvs->drop_counter
= ipvs->sysctl_amemthresh /
(ipvs->sysctl_amemthresh-availmem);
ipvs->drop_counter = amemthresh / (amemthresh - availmem);
ipvs->drop_rate = ipvs->drop_counter;
ipvs->sysctl_drop_packet = 2;
} else {
ipvs->drop_rate = 0;
@ -155,9 +156,8 @@ static void update_defense_level(struct netns_ipvs *ipvs)
break;
case 2:
if (nomem) {
ipvs->drop_rate = ipvs->drop_counter
= ipvs->sysctl_amemthresh /
(ipvs->sysctl_amemthresh-availmem);
ipvs->drop_counter = amemthresh / (amemthresh - availmem);
ipvs->drop_rate = ipvs->drop_counter;
} else {
ipvs->drop_rate = 0;
ipvs->sysctl_drop_packet = 1;