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[NETFILTER]: nfnetlink_log: fix checks in nfulnl_recv_config

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Similar to the nfnetlink_queue fixes:

The peer_pid must be checked in all cases when a logging instance exists,
additionally we must check whether an instance exists before attempting
to configure it to avoid NULL ptr dereferences.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-12-17 22:39:55 -08:00 committed by David S. Miller
parent a7c42955e0
commit c0506365a9
1 changed files with 27 additions and 22 deletions
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49
net/netfilter/nfnetlink_log.c
View file

@ -753,9 +753,15 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
UDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh->nlmsg_type));
inst = instance_lookup_get(group_num);
if (inst && inst->peer_pid != NETLINK_CB(skb).pid) {
ret = -EPERM;
goto out_put;
}
if (nfula[NFULA_CFG_CMD]) {
u_int8_t pf = nfmsg->nfgen_family;
struct nfulnl_msg_config_cmd *cmd;
cmd = nla_data(nfula[NFULA_CFG_CMD]);
UDEBUG("found CFG_CMD for\n");
@ -779,11 +785,6 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
goto out;
}
if (inst->peer_pid != NETLINK_CB(skb).pid) {
ret = -EPERM;
goto out_put;
}
instance_destroy(inst);
goto out;
case NFULNL_CFG_CMD_PF_BIND:
@ -800,29 +801,16 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
ret = -EINVAL;
break;
}
if (!inst)
goto out;
} else {
if (!inst) {
UDEBUG("no config command, and no instance for "
"group=%u pid=%u =>ENOENT\n",
group_num, NETLINK_CB(skb).pid);
ret = -ENOENT;
goto out;
}
if (inst->peer_pid != NETLINK_CB(skb).pid) {
UDEBUG("no config command, and wrong pid\n");
ret = -EPERM;
goto out_put;
}
}
if (nfula[NFULA_CFG_MODE]) {
struct nfulnl_msg_config_mode *params;
params = nla_data(nfula[NFULA_CFG_MODE]);
if (!inst) {
ret = -ENODEV;
goto out;
}
nfulnl_set_mode(inst, params->copy_mode,
ntohl(params->copy_range));
}
@ -831,6 +819,10 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
__be32 timeout =
*(__be32 *)nla_data(nfula[NFULA_CFG_TIMEOUT]);
if (!inst) {
ret = -ENODEV;
goto out;
}
nfulnl_set_timeout(inst, ntohl(timeout));
}
@ -838,6 +830,10 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
__be32 nlbufsiz =
*(__be32 *)nla_data(nfula[NFULA_CFG_NLBUFSIZ]);
if (!inst) {
ret = -ENODEV;
goto out;
}
nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
}
@ -845,12 +841,21 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
__be32 qthresh =
*(__be32 *)nla_data(nfula[NFULA_CFG_QTHRESH]);
if (!inst) {
ret = -ENODEV;
goto out;
}
nfulnl_set_qthresh(inst, ntohl(qthresh));
}
if (nfula[NFULA_CFG_FLAGS]) {
__be16 flags =
*(__be16 *)nla_data(nfula[NFULA_CFG_FLAGS]);
if (!inst) {
ret = -ENODEV;
goto out;
}
nfulnl_set_flags(inst, ntohs(flags));
}