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ipv6: exthdrs: annotate data-race over multiple sysctl

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Following four sysctls can change under us, add missing READ_ONCE().

- ipv6.sysctl.max_dst_opts_len
- ipv6.sysctl.max_dst_opts_cnt
- ipv6.sysctl.max_hbh_opts_len
- ipv6.sysctl.max_hbh_opts_cnt

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260115094141.3124990-8-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-01-15 09:41:40 +00:00
committed by Jakub Kicinski
parent 12eddc6857
commit 978b67d283
1 changed files with 6 additions and 4 deletions
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10
net/ipv6/exthdrs.c
View File

@@ -314,7 +314,7 @@ static int ipv6_destopt_rcv(struct sk_buff *skb)
}
extlen = (skb_transport_header(skb)[1] + 1) << 3;
if (extlen > net->ipv6.sysctl.max_dst_opts_len)
if (extlen > READ_ONCE(net->ipv6.sysctl.max_dst_opts_len))
goto fail_and_free;
opt->lastopt = opt->dst1 = skb_network_header_len(skb);
@@ -322,7 +322,8 @@ static int ipv6_destopt_rcv(struct sk_buff *skb)
dstbuf = opt->dst1;
#endif
if (ip6_parse_tlv(false, skb, net->ipv6.sysctl.max_dst_opts_cnt)) {
if (ip6_parse_tlv(false, skb,
READ_ONCE(net->ipv6.sysctl.max_dst_opts_cnt))) {
skb->transport_header += extlen;
opt = IP6CB(skb);
#if IS_ENABLED(CONFIG_IPV6_MIP6)
@@ -1049,11 +1050,12 @@ int ipv6_parse_hopopts(struct sk_buff *skb)
}
extlen = (skb_transport_header(skb)[1] + 1) << 3;
if (extlen > net->ipv6.sysctl.max_hbh_opts_len)
if (extlen > READ_ONCE(net->ipv6.sysctl.max_hbh_opts_len))
goto fail_and_free;
opt->flags |= IP6SKB_HOPBYHOP;
if (ip6_parse_tlv(true, skb, net->ipv6.sysctl.max_hbh_opts_cnt)) {
if (ip6_parse_tlv(true, skb,
READ_ONCE(net->ipv6.sysctl.max_hbh_opts_cnt))) {
skb->transport_header += extlen;
opt = IP6CB(skb);
opt->nhoff = sizeof(struct ipv6hdr);