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ipv6: use READ_ONCE() in ipv6_flowlabel_get()

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ipv6_flowlabel_get() reads flowlabel_consistency and
flowlabel_state_ranges locklessly.

Use READ_ONCE() for these sysctl accesses.

Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260602002506.1519901-1-runyu.xiao@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Runyu Xiao
2026-06-02 08:25:06 +08:00
committed by Jakub Kicinski
parent 7a20eb5422
commit f425c55cb6
1 changed files with 2 additions and 2 deletions
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4
net/ipv6/ip6_flowlabel.c
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@@ -620,7 +620,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
int err;
if (freq->flr_flags & IPV6_FL_F_REFLECT) {
if (net->ipv6.sysctl.flowlabel_consistency) {
if (READ_ONCE(net->ipv6.sysctl.flowlabel_consistency)) {
net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
return -EPERM;
}
@@ -633,7 +633,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
if (freq->flr_label & ~IPV6_FLOWLABEL_MASK)
return -EINVAL;
if (net->ipv6.sysctl.flowlabel_state_ranges &&
if (READ_ONCE(net->ipv6.sysctl.flowlabel_state_ranges) &&
(freq->flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
return -ERANGE;