From: Gao feng <gaofeng@cn.fujitsu.com>
To: fengguang.wu@intel.com
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Gao feng <gaofeng@cn.fujitsu.com>
Subject: [PATCH] netlink: make compare exist all the time
Date: Thu, 13 Jun 2013 10:05:38 +0800 [thread overview]
Message-ID: <1371089138-4990-1-git-send-email-gaofeng@cn.fujitsu.com> (raw)
In-Reply-To: <20130613012216.GA6788@localhost>
Commit da12c90e099789a63073fc82a19542ce54d4efb9
"netlink: Add compare function for netlink_table"
only set compare at the time we create kernel netlink,
and reset compare to NULL at the time we finially
release netlink socket, but netlink_lookup wants
the compare exist always.
So we should set compare after we allocate nl_table,
and never reset it. make comapre exist all the time.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
---
net/netlink/af_netlink.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 9b6b115..8978755 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1174,7 +1174,6 @@ static int netlink_release(struct socket *sock)
kfree_rcu(old, rcu);
nl_table[sk->sk_protocol].module = NULL;
nl_table[sk->sk_protocol].bind = NULL;
- nl_table[sk->sk_protocol].compare = NULL;
nl_table[sk->sk_protocol].flags = 0;
nl_table[sk->sk_protocol].registered = 0;
}
@@ -2326,7 +2325,6 @@ __netlink_kernel_create(struct net *net, int unit, struct module *module,
rcu_assign_pointer(nl_table[unit].listeners, listeners);
nl_table[unit].cb_mutex = cb_mutex;
nl_table[unit].module = module;
- nl_table[unit].compare = netlink_compare;
if (cfg) {
nl_table[unit].bind = cfg->bind;
nl_table[unit].flags = cfg->flags;
@@ -2973,6 +2971,8 @@ static int __init netlink_proto_init(void)
hash->shift = 0;
hash->mask = 0;
hash->rehash_time = jiffies;
+
+ nl_table[i].compare = netlink_compare;
}
netlink_add_usersock_entry();
--
1.8.1.4
next prev parent reply other threads:[~2013-06-13 2:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-13 1:22 [netlink_lookup] BUG: unable to handle kernel NULL pointer dereference at (null) Fengguang Wu
2013-06-13 1:44 ` Gao feng
2013-06-13 2:05 ` Gao feng [this message]
2013-06-13 7:46 ` [PATCH] netlink: make compare exist all the time David Miller
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=1371089138-4990-1-git-send-email-gaofeng@cn.fujitsu.com \
--to=gaofeng@cn.fujitsu.com \
--cc=fengguang.wu@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@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
all inboxes | Powered by JetHome®