netdev - [iproute PATCH] tc: m_xt: Fix segfault with iptables-1.6.0

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Date:   Thu, 12 Jan 2017 15:22:49 +0100
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: [iproute PATCH] tc: m_xt: Fix segfault with iptables-1.6.0

Said iptables version introduced struct xtables_globals field
'compat_rev', a function pointer. Initializing it is mandatory as
libxtables calls it without existence check.

Without this, tc segfaults when using the xt action like so:

| tc filter add dev d0 parent ffff: u32 match u32 0 0 \
|	action xt -j MARK --set-mark 20

Signed-off-by: Phil Sutter <phil@....cc>
---
 tc/m_xt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tc/m_xt.c b/tc/m_xt.c
index dbb54981462ee..57ed40d7aa3a8 100644
--- a/tc/m_xt.c
+++ b/tc/m_xt.c
@@ -77,6 +77,9 @@ static struct xtables_globals tcipt_globals = {
 	.orig_opts = original_opts,
 	.opts = original_opts,
 	.exit_err = NULL,
+#if (XTABLES_VERSION_CODE >= 11)
+	.compat_rev = xtables_compatible_revision,
+#endif
 };
 
 /*
-- 
2.11.0