linux-kernel - [PATCH 4.4 004/101] net: Zero ifla_vf_info in rtnl_fill

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Message-Id: <20170703133335.015124393@linuxfoundation.org>
Date:   Mon,  3 Jul 2017 15:34:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yuval Mintz <Yuval.Mintz@...ium.com>,
        Michal Schmidt <mschmidt@...hat.com>,
        Greg Rose <gvrose8192@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 004/101] net: Zero ifla_vf_info in rtnl_fill_vfinfo()

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

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

From: "Mintz, Yuval" <Yuval.Mintz@...ium.com>


[ Upstream commit 0eed9cf58446b28b233388b7f224cbca268b6986 ]

Some of the structure's fields are not initialized by the
rtnetlink. If driver doesn't set those in ndo_get_vf_config(),
they'd leak memory to user.

Signed-off-by: Yuval Mintz <Yuval.Mintz@...ium.com>
CC: Michal Schmidt <mschmidt@...hat.com>
Reviewed-by: Greg Rose <gvrose8192@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/rtnetlink.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1089,6 +1089,8 @@ static noinline_for_stack int rtnl_fill_
 	struct ifla_vf_mac vf_mac;
 	struct ifla_vf_info ivi;
 
+	memset(&ivi, 0, sizeof(ivi));
+
 	/* Not all SR-IOV capable drivers support the
 	 * spoofcheck and "RSS query enable" query.  Preset to
 	 * -1 so the user space tool can detect that the driver
@@ -1097,7 +1099,6 @@ static noinline_for_stack int rtnl_fill_
 	ivi.spoofchk = -1;
 	ivi.rss_query_en = -1;
 	ivi.trusted = -1;
-	memset(ivi.mac, 0, sizeof(ivi.mac));
 	/* The default value for VF link state is "auto"
 	 * IFLA_VF_LINK_STATE_AUTO which equals zero
 	 */