From c0506365a928adfd5608ed6873a705ae18e2daaf Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Mon, 17 Dec 2007 22:39:55 -0800 Subject: [PATCH] [NETFILTER]: nfnetlink_log: fix checks in nfulnl_recv_config 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 Signed-off-by: David S. Miller --- net/netfilter/nfnetlink_log.c | 49 +++++++++++++++++++---------------- 1 file changed, 27 insertions(+), 22 deletions(-) diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index 02e63577e156..3dcc6f51a52e 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -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)); } -- 2.20.1