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| author |   Hans Schillstrom <hans@schillstrom.com> | 2013-05-15 01:23:45 +0000 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2013-05-15 14:11:07 +0200 |
| commit | 8cdb46da06ea94543a3b2e53e3e92736421d1093 (patch) | |
| tree | 2f3d5703ee736daf10a3556c5c80f6bcca8731b8 /net/netfilter/xt_LOG.c | |
| parent | netfilter: update MAINTAINERS file (diff) | |
| download | linux-dev-8cdb46da06ea94543a3b2e53e3e92736421d1093.tar.xz linux-dev-8cdb46da06ea94543a3b2e53e3e92736421d1093.zip | |
netfilter: log: netns NULL ptr bug when calling from conntrack
Since (69b34fb netfilter: xt_LOG: add net namespace support
for xt_LOG), we hit this:
[ 4224.708977] BUG: unable to handle kernel NULL pointer dereference at 0000000000000388
[ 4224.709074] IP: [<ffffffff8147f699>] ipt_log_packet+0x29/0x270
when callling log functions from conntrack both in and out
are NULL i.e. the net pointer is invalid.
Adding struct net *net in call to nf_logfn() will secure that
there always is a vaild net ptr.
Reported as netfilter's bugzilla bug 818:
https://bugzilla.netfilter.org/show_bug.cgi?id=818
Reported-by: Ronald <ronald645@gmail.com>
Signed-off-by: Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/xt_LOG.c')
| -rw-r--r-- | net/netfilter/xt_LOG.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c index fe573f6c9e91..491c7d821a0b 100644 --- a/net/netfilter/xt_LOG.c +++ b/net/netfilter/xt_LOG.c @@ -466,7 +466,8 @@ log_packet_common(struct sbuff *m, static void -ipt_log_packet(u_int8_t pf, +ipt_log_packet(struct net *net, + u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, @@ -475,7 +476,6 @@ ipt_log_packet(u_int8_t pf, const char *prefix) { struct sbuff *m; - struct net *net = dev_net(in ? in : out); /* FIXME: Disabled from containers until syslog ns is supported */ if (!net_eq(net, &init_net)) @@ -797,7 +797,8 @@ fallback: } static void -ip6t_log_packet(u_int8_t pf, +ip6t_log_packet(struct net *net, + u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, @@ -806,7 +807,6 @@ ip6t_log_packet(u_int8_t pf, const char *prefix) { struct sbuff *m; - struct net *net = dev_net(in ? in : out); /* FIXME: Disabled from containers until syslog ns is supported */ if (!net_eq(net, &init_net)) @@ -833,17 +833,18 @@ log_tg(struct sk_buff *skb, const struct xt_action_param *par) { const struct xt_log_info *loginfo = par->targinfo; struct nf_loginfo li; + struct net *net = dev_net(par->in ? par->in : par->out); li.type = NF_LOG_TYPE_LOG; li.u.log.level = loginfo->level; li.u.log.logflags = loginfo->logflags; if (par->family == NFPROTO_IPV4) - ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in, + ipt_log_packet(net, NFPROTO_IPV4, par->hooknum, skb, par->in, par->out, &li, loginfo->prefix); #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) else if (par->family == NFPROTO_IPV6) - ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in, + ip6t_log_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in, par->out, &li, loginfo->prefix); #endif else |