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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/ipv4 | |
| parent | 42010ed0c669aeb1c5b015f5edf590c73919380c (diff) | |
| download | blackbird-op-linux-8cdb46da06ea94543a3b2e53e3e92736421d1093.tar.gz blackbird-op-linux-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/ipv4')
| -rw-r--r-- | net/ipv4/netfilter/ipt_ULOG.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c index f8a222cb6448..cf08218ddbcf 100644 --- a/net/ipv4/netfilter/ipt_ULOG.c +++ b/net/ipv4/netfilter/ipt_ULOG.c @@ -162,7 +162,8 @@ static struct sk_buff *ulog_alloc_skb(unsigned int size) return skb; } -static void ipt_ulog_packet(unsigned int hooknum, +static void ipt_ulog_packet(struct net *net, + unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, @@ -174,7 +175,6 @@ static void ipt_ulog_packet(unsigned int hooknum, size_t size, copy_len; struct nlmsghdr *nlh; struct timeval tv; - struct net *net = dev_net(in ? in : out); struct ulog_net *ulog = ulog_pernet(net); /* ffs == find first bit set, necessary because userspace @@ -291,12 +291,15 @@ alloc_failure: static unsigned int ulog_tg(struct sk_buff *skb, const struct xt_action_param *par) { - ipt_ulog_packet(par->hooknum, skb, par->in, par->out, + struct net *net = dev_net(par->in ? par->in : par->out); + + ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out, par->targinfo, NULL); return XT_CONTINUE; } -static void ipt_logfn(u_int8_t pf, +static void ipt_logfn(struct net *net, + u_int8_t pf, unsigned int hooknum, const struct sk_buff *skb, const struct net_device *in, @@ -318,7 +321,7 @@ static void ipt_logfn(u_int8_t pf, strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix)); } - ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix); + ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix); } static int ulog_tg_check(const struct xt_tgchk_param *par) |
