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Date:   Mon, 27 Apr 2020 08:10:55 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com,
        alexanderk@...lanox.com, mlxsw@...lanox.com
Subject: [patch iproute2] tc: m_action: check cookie hex string len

From: Jiri Pirko <jiri@...lanox.com>

Check the cookie hex string len is dividable by 2 as the valid hex
string always should be.

Reported-by: Alex Kushnarov <alexanderk@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 tc/m_action.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tc/m_action.c b/tc/m_action.c
index 108329db29d0..b41782de9a02 100644
--- a/tc/m_action.c
+++ b/tc/m_action.c
@@ -291,7 +291,8 @@ done0:
 					invarg(cookie_err_m, *argv);
 				}
 
-				if (hex2mem(*argv, act_ck, slen / 2) < 0)
+				if (slen % 2 ||
+				    hex2mem(*argv, act_ck, slen / 2) < 0)
 					invarg("cookie must be a hex string\n",
 					       *argv);
 
-- 
2.21.1

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