From: Giuliano Procida <gprocida@google.com>
To: greg@kroah.com
Cc: stable@vger.kernel.org, Guillaume Nault <g.nault@alphalink.fr>,
"David S . Miller" <davem@davemloft.net>,
Giuliano Procida <gprocida@google.com>
Subject: [PATCH 06/22] l2tp: remove useless duplicate session detection in l2tp_netlink
Date: Thu, 21 May 2020 15:40:44 +0100 [thread overview]
Message-ID: <20200521144100.128936-7-gprocida@google.com> (raw)
In-Reply-To: <20200521144100.128936-1-gprocida@google.com>
From: Guillaume Nault <g.nault@alphalink.fr>
commit af87ae465abdc070de0dc35d6c6a9e7a8cd82987 uptream.
There's no point in checking for duplicate sessions at the beginning of
l2tp_nl_cmd_session_create(); the ->session_create() callbacks already
return -EEXIST when the session already exists.
Furthermore, even if l2tp_session_find() returns NULL, a new session
might be created right after the test. So relying on ->session_create()
to avoid duplicate session is the only sane behaviour.
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Giuliano Procida <gprocida@google.com>
---
net/l2tp/l2tp_netlink.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index d6fccfdca201..36651b60d776 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -513,11 +513,6 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
goto out;
}
session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
- session = l2tp_session_find(net, tunnel, session_id);
- if (session) {
- ret = -EEXIST;
- goto out;
- }
if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
ret = -EINVAL;
--
2.26.2.761.g0e0b3e54be-goog
next prev parent reply other threads:[~2020-05-21 14:41 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 14:40 [PATCH 00/22] l2tp locking and ordering fixes Giuliano Procida
2020-05-21 14:40 ` [PATCH 01/22] net: l2tp: export debug flags to UAPI Giuliano Procida
2020-05-21 14:40 ` [PATCH 02/22] net: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_* Giuliano Procida
2020-05-21 14:40 ` [PATCH 03/22] net: l2tp: ppp: change PPPOL2TP_MSG_* => L2TP_MSG_* Giuliano Procida
2020-05-21 14:40 ` [PATCH 04/22] New kernel function to get IP overhead on a socket Giuliano Procida
2020-05-21 14:40 ` [PATCH 05/22] L2TP:Adjust intf MTU, add underlay L3, L2 hdrs Giuliano Procida
2020-05-21 14:40 ` Giuliano Procida [this message]
2020-05-21 14:40 ` [PATCH 07/22] l2tp: remove l2tp_session_find() Giuliano Procida
2020-05-21 14:40 ` [PATCH 08/22] l2tp: define parameters of l2tp_session_get*() as "const" Giuliano Procida
2020-05-21 14:40 ` [PATCH 09/22] l2tp: define parameters of l2tp_tunnel_find*() " Giuliano Procida
2020-05-21 14:40 ` [PATCH 10/22] l2tp: initialise session's refcount before making it reachable Giuliano Procida
2020-05-21 14:40 ` [PATCH 11/22] l2tp: hold tunnel while looking up sessions in l2tp_netlink Giuliano Procida
2020-05-21 14:40 ` [PATCH 12/22] l2tp: hold tunnel while processing genl delete command Giuliano Procida
2020-05-21 14:40 ` [PATCH 13/22] l2tp: hold tunnel while handling genl tunnel updates Giuliano Procida
2020-05-21 14:40 ` [PATCH 14/22] l2tp: hold tunnel while handling genl TUNNEL_GET commands Giuliano Procida
2020-05-21 14:40 ` [PATCH 15/22] l2tp: hold tunnel used while creating sessions with netlink Giuliano Procida
2020-05-21 14:40 ` [PATCH 16/22] l2tp: prevent creation of sessions on terminated tunnels Giuliano Procida
2020-05-21 14:40 ` [PATCH 17/22] l2tp: pass tunnel pointer to ->session_create() Giuliano Procida
2020-05-21 14:40 ` [PATCH 18/22] l2tp: fix l2tp_eth module loading Giuliano Procida
2020-05-21 14:40 ` [PATCH 19/22] l2tp: don't register sessions in l2tp_session_create() Giuliano Procida
2020-05-21 14:40 ` [PATCH 20/22] l2tp: initialise l2tp_eth sessions before registering them Giuliano Procida
2020-05-21 14:40 ` [PATCH 21/22] l2tp: protect sock pointer of struct pppol2tp_session with RCU Giuliano Procida
2020-05-21 14:41 ` [PATCH 22/22] l2tp: initialise PPP sessions before registering them Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 00/22] l2tp locking and ordering fixes Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 01/22] net: l2tp: export debug flags to UAPI Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 02/22] net: l2tp: deprecate PPPOL2TP_MSG_* in favour of L2TP_MSG_* Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 03/22] net: l2tp: ppp: change PPPOL2TP_MSG_* => L2TP_MSG_* Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 04/22] New kernel function to get IP overhead on a socket Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 05/22] L2TP:Adjust intf MTU, add underlay L3, L2 hdrs Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 06/22] l2tp: remove useless duplicate session detection in l2tp_netlink Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 07/22] l2tp: remove l2tp_session_find() Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 08/22] l2tp: define parameters of l2tp_session_get*() as "const" Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 09/22] l2tp: define parameters of l2tp_tunnel_find*() " Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 10/22] l2tp: initialise session's refcount before making it reachable Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 11/22] l2tp: hold tunnel while looking up sessions in l2tp_netlink Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 12/22] l2tp: hold tunnel while processing genl delete command Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 13/22] l2tp: hold tunnel while handling genl tunnel updates Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 14/22] l2tp: hold tunnel while handling genl TUNNEL_GET commands Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 15/22] l2tp: hold tunnel used while creating sessions with netlink Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 16/22] l2tp: prevent creation of sessions on terminated tunnels Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 17/22] l2tp: pass tunnel pointer to ->session_create() Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 18/22] l2tp: fix l2tp_eth module loading Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 19/22] l2tp: don't register sessions in l2tp_session_create() Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 20/22] l2tp: initialise l2tp_eth sessions before registering them Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 21/22] l2tp: protect sock pointer of struct pppol2tp_session with RCU Giuliano Procida
2020-05-21 23:39 ` [PATCH v2 22/22] l2tp: initialise PPP sessions before registering them Giuliano Procida
2020-05-22 12:15 ` [PATCH v2 00/22] l2tp locking and ordering fixes Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200521144100.128936-7-gprocida@google.com \
--to=gprocida@google.com \
--cc=davem@davemloft.net \
--cc=g.nault@alphalink.fr \
--cc=greg@kroah.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).