netdev - [PATCH 2/5] net: Validate IFLA_BRIDGE

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Date:	Wed, 26 Nov 2014 13:42:17 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org,
	Ajit Khaparde <ajit.khaparde@...lex.com>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: [PATCH 2/5] net: Validate IFLA_BRIDGE_MODE attribute length

Payload is currently accessed blindly and may exceed valid message
boundaries.

Fixes: a77dcb8c8 ("be2net: set and query VEB/VEPA mode of the PF interface")
Fixes: 815cccbf1 ("ixgbe: add setlink, getlink support to ixgbe and ixgbevf")
Cc: Ajit Khaparde <ajit.khaparde@...lex.com>
Cc: John Fastabend <john.r.fastabend@...el.com>
Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
 drivers/net/ethernet/emulex/benet/be_main.c   | 3 +++
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 3e8475c..337e4cd 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -4314,6 +4314,9 @@ static int be_ndo_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh)
 		if (nla_type(attr) != IFLA_BRIDGE_MODE)
 			continue;
 
+		if (nla_len(attr) < sizeof(mode))
+			return -EINVAL;
+
 		mode = nla_get_u16(attr);
 		if (mode != BRIDGE_MODE_VEPA && mode != BRIDGE_MODE_VEB)
 			return -EINVAL;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 82ffe8b..dff9905 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -7677,6 +7677,9 @@ static int ixgbe_ndo_bridge_setlink(struct net_device *dev,
 		if (nla_type(attr) != IFLA_BRIDGE_MODE)
 			continue;
 
+		if (nla_len(attr) < sizeof(mode))
+			return -EINVAL;
+
 		mode = nla_get_u16(attr);
 		if (mode == BRIDGE_MODE_VEPA) {
 			reg = 0;
-- 
1.9.3

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