Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 152/421] ipv6: exthdrs: do not blindly use init_net | Date | Mon, 19 Jul 2021 16:49:23 +0200 |
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From: Eric Dumazet <edumazet@google.com>
[ Upstream commit bcc3f2a829b9edbe3da5fb117ee5a63686d31834 ]
I see no reason why max_dst_opts_cnt and max_hbh_opts_cnt are fetched from the initial net namespace.
The other sysctls (max_dst_opts_len & max_hbh_opts_len) are in fact already using the current ns.
Note: it is not clear why ipv6_destopt_rcv() use two ways to get to the netns :
1) dev_net(dst->dev) Originally used to increment IPSTATS_MIB_INHDRERRORS
2) dev_net(skb->dev) Tom used this variant in his patch.
Maybe this calls to use ipv6_skb_net() instead ?
Fixes: 47d3d7ac656a ("ipv6: Implement limits on Hop-by-Hop and Destination options") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <tom@quantonium.net> Cc: Coco Li <lixiaoyan@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/ipv6/exthdrs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 20291c2036fc..68b8084da83a 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -309,7 +309,7 @@ fail_and_free: #endif if (ip6_parse_tlv(tlvprocdestopt_lst, skb, - init_net.ipv6.sysctl.max_dst_opts_cnt)) { + net->ipv6.sysctl.max_dst_opts_cnt)) { skb->transport_header += extlen; opt = IP6CB(skb); #if IS_ENABLED(CONFIG_IPV6_MIP6) @@ -848,7 +848,7 @@ fail_and_free: opt->flags |= IP6SKB_HOPBYHOP; if (ip6_parse_tlv(tlvprochopopt_lst, skb, - init_net.ipv6.sysctl.max_hbh_opts_cnt)) { + net->ipv6.sysctl.max_hbh_opts_cnt)) { skb->transport_header += extlen; opt = IP6CB(skb); opt->nhoff = sizeof(struct ipv6hdr); -- 2.30.2
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