diff options
author | Patrick McHardy <kaber@trash.net> | 2007-12-17 22:39:55 -0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:59:00 -0800 |
commit | c0506365a928adfd5608ed6873a705ae18e2daaf (patch) | |
tree | e61abaf91c2b198f1b8c5db45ad46eb0bff2c9c8 /net/netfilter/nfnetlink_log.c | |
parent | a7c42955e036127f793ad955d3ec718494efb1eb (diff) | |
download | kernel_samsung_espresso10-c0506365a928adfd5608ed6873a705ae18e2daaf.zip kernel_samsung_espresso10-c0506365a928adfd5608ed6873a705ae18e2daaf.tar.gz kernel_samsung_espresso10-c0506365a928adfd5608ed6873a705ae18e2daaf.tar.bz2 |
[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 <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter/nfnetlink_log.c')
-rw-r--r-- | net/netfilter/nfnetlink_log.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index 02e6357..3dcc6f5 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)); } |