diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-10-13 12:47:47 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-10-15 06:44:31 +0200 |
commit | 336a3b3ee925362ca720342bbae4f36b2215064a (patch) | |
tree | 51a34113111215dd00b95769a594aed6b7ff1a2a /net | |
parent | dbb526ebfec1a322405b7cfcb0c46730f9865ec6 (diff) | |
download | op-kernel-dev-336a3b3ee925362ca720342bbae4f36b2215064a.zip op-kernel-dev-336a3b3ee925362ca720342bbae4f36b2215064a.tar.gz |
netfilter: nfnetlink_log: consolidate check for instance in nfulnl_recv_config()
This patch consolidates the check for valid logger instance once we have
passed the command handling:
The config message that we receive may contain the following info:
1) Command only: We always get a valid instance pointer if we just
created it. In case that the instance is being destroyed or the
command is unknown, we jump to exit path of nfulnl_recv_config().
This patch doesn't modify this handling.
2) Config only: In this case, the instance must always exist since the
user is asking for configuration updates. If the instance doesn't exist
this returns -ENODEV.
3) No command and no configs are specified: This case is rare. The
user is sending us a config message with neither commands nor
config options. In this case, we have to check if the instance exists
and bail out otherwise. Before this patch, it was possible to send a
config message with no command and no config updates for an
unexisting instance without triggering an error. So this is the only
case that changes.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Tested-by: Ken-ichirou MATSUZAWA <chamaken@gmail.com>
Diffstat (limited to 'net')
-rw-r--r-- | net/netfilter/nfnetlink_log.c | 28 |
1 files changed, 5 insertions, 23 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index f8d9bd84..2002d57 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -874,16 +874,15 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, ret = -ENOTSUPP; break; } + } else if (!inst) { + ret = -ENODEV; + goto out; } if (nfula[NFULA_CFG_MODE]) { - struct nfulnl_msg_config_mode *params; - params = nla_data(nfula[NFULA_CFG_MODE]); + struct nfulnl_msg_config_mode *params = + nla_data(nfula[NFULA_CFG_MODE]); - if (!inst) { - ret = -ENODEV; - goto out; - } nfulnl_set_mode(inst, params->copy_mode, ntohl(params->copy_range)); } @@ -891,41 +890,24 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, if (nfula[NFULA_CFG_TIMEOUT]) { __be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]); - if (!inst) { - ret = -ENODEV; - goto out; - } nfulnl_set_timeout(inst, ntohl(timeout)); } if (nfula[NFULA_CFG_NLBUFSIZ]) { __be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]); - if (!inst) { - ret = -ENODEV; - goto out; - } nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz)); } if (nfula[NFULA_CFG_QTHRESH]) { __be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]); - if (!inst) { - ret = -ENODEV; - goto out; - } nfulnl_set_qthresh(inst, ntohl(qthresh)); } if (nfula[NFULA_CFG_FLAGS]) { u16 flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS])); - if (!inst) { - ret = -ENODEV; - goto out; - } - if (flags & NFULNL_CFG_F_CONNTRACK && !rcu_access_pointer(nfnl_ct_hook)) { #ifdef CONFIG_MODULES |