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[NETFILTER]: nfnetlink_queue: fix checks in nfqnl_recv_config 

The peer_pid must be checked in all cases when a queue exists, currently
it is not checked if for NFQA_CFG_QUEUE_MAXLEN when a NFQA_CFG_CMD
attribute exists in some cases. Same for the queue existance check,
which can cause a NULL pointer dereference.

Also consistently return -ENODEV for "queue not found". -ENOENT would
be better, but that is already used to indicate a queued skb id doesn't
exist.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-12-05 01:28:30 -08:00 committed by David S. Miller
parent e48b9b2fb3
commit a3c8e7fd4b
1 changed files with 12 additions and 19 deletions
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31
net/netfilter/nfnetlink_queue.c
View File

@ -781,8 +781,14 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
queue = instance_lookup_get(queue_num);
if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
ret = -EPERM;
goto out_put;
}
if (nfqa[NFQA_CFG_CMD]) {
struct nfqnl_msg_config_cmd *cmd;
cmd = nla_data(nfqa[NFQA_CFG_CMD]);
QDEBUG("found CFG_CMD\n");
@ -798,12 +804,6 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
case NFQNL_CFG_CMD_UNBIND:
if (!queue)
return -ENODEV;
if (queue->peer_pid != NETLINK_CB(skb).pid) {
ret = -EPERM;
goto out_put;
}
instance_destroy(queue);
break;
case NFQNL_CFG_CMD_PF_BIND:
@ -820,25 +820,13 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
ret = -EINVAL;
break;
}
} else {
if (!queue) {
QDEBUG("no config command, and no instance ENOENT\n");
ret = -ENOENT;
goto out_put;
}
if (queue->peer_pid != NETLINK_CB(skb).pid) {
QDEBUG("no config command, and wrong pid\n");
ret = -EPERM;
goto out_put;
}
}
if (nfqa[NFQA_CFG_PARAMS]) {
struct nfqnl_msg_config_params *params;
if (!queue) {
ret = -ENOENT;
ret = -ENODEV;
goto out_put;
}
params = nla_data(nfqa[NFQA_CFG_PARAMS]);
@ -848,6 +836,11 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
__be32 *queue_maxlen;
if (!queue) {
ret = -ENODEV;
goto out_put;
}
queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
spin_lock_bh(&queue->lock);
queue->queue_maxlen = ntohl(*queue_maxlen);