[PATCH 4.9 31/35] ebtables: arpreply: Add the standard target sanity check

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gao Feng <gfree.wind@vip.163.com>

commit c953d63548207a085abcb12a15fefc8a11ffdf0a upstream.

The info->target comes from userspace and it would be used directly.
So we need to add the sanity check to make sure it is a valid standard
target, although the ebtables tool has already checked it. Kernel needs
to validate anything coming from userspace.

If the target is set as an evil value, it would break the ebtables
and cause a panic. Because the non-standard target is treated as one
offset.

Now add one helper function ebt_invalid_target, and we would replace
the macro INVALID_TARGET later.

Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Loic <hackurx@opensec.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/netfilter_bridge/ebtables.h |    5 +++++
 net/bridge/netfilter/ebt_arpreply.c       |    3 +++
 2 files changed, 8 insertions(+)

--- a/include/linux/netfilter_bridge/ebtables.h
+++ b/include/linux/netfilter_bridge/ebtables.h
@@ -123,4 +123,9 @@ extern unsigned int ebt_do_table(struct
 /* True if the target is not a standard target */
 #define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
 
+static inline bool ebt_invalid_target(int target)
+{
+	return (target < -NUM_STANDARD_TARGETS || target >= 0);
+}
+
 #endif
--- a/net/bridge/netfilter/ebt_arpreply.c
+++ b/net/bridge/netfilter/ebt_arpreply.c
@@ -67,6 +67,9 @@ static int ebt_arpreply_tg_check(const s
 	if (e->ethproto != htons(ETH_P_ARP) ||
 	    e->invflags & EBT_IPROTO)
 		return -EINVAL;
+	if (ebt_invalid_target(info->target))
+		return -EINVAL;
+
 	return 0;
 }