diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-03-27 19:37:41 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-04-01 11:26:42 +0200 |
| commit | afb7718016fcb0370ac29a83b2839c78b76c2960 (patch) | |
| tree | 41dbbd1901d52632a4570bcd76f8506e9a0edf29 /net/netfilter | |
| parent | netfilter: nft_hash: add support for timeouts (diff) | |
| download | linux-afb7718016fcb0370ac29a83b2839c78b76c2960.tar.xz linux-afb7718016fcb0370ac29a83b2839c78b76c2960.zip | |
netfilter: x_tables: fix cgroup matching on non-full sks
While originally only being intended for outgoing traffic, commit
a00e76349f35 ("netfilter: x_tables: allow to use cgroup match for
LOCAL_IN nf hooks") enabled xt_cgroups for the NF_INET_LOCAL_IN hook
as well, in order to allow for nfacct accounting.
Besides being currently limited to early demuxes only, commit
a00e76349f35 forgot to add a check if we deal with full sockets,
i.e. in this case not with time wait sockets. TCP time wait sockets
do not have the same memory layout as full sockets, a lower memory
footprint and consequently also don't have a sk_classid member;
probing for sk_classid member there could potentially lead to a
crash.
Fixes: a00e76349f35 ("netfilter: x_tables: allow to use cgroup match for LOCAL_IN nf hooks")
Cc: Alexey Perevalov <a.perevalov@samsung.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/xt_cgroup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/xt_cgroup.c b/net/netfilter/xt_cgroup.c index 7198d660b4de..a1d126f29463 100644 --- a/net/netfilter/xt_cgroup.c +++ b/net/netfilter/xt_cgroup.c @@ -39,7 +39,7 @@ cgroup_mt(const struct sk_buff *skb, struct xt_action_param *par) { const struct xt_cgroup_info *info = par->matchinfo; - if (skb->sk == NULL) + if (skb->sk == NULL || !sk_fullsock(skb->sk)) return false; return (info->id == skb->sk->sk_classid) ^ info->invert; |