netdev - [PATCH v1] i40e: Add length check for IFLA_AF

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Message-Id: <20230723075042.3709043-1-linma@zju.edu.cn>
Date: Sun, 23 Jul 2023 15:50:42 +0800
From: Lin Ma <linma@....edu.cn>
To: jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	richardcochran@...il.com,
	ast@...nel.org,
	daniel@...earbox.net,
	hawk@...nel.org,
	john.fastabend@...il.com,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Lin Ma <linma@....edu.cn>
Subject: [PATCH v1] i40e: Add length check for IFLA_AF_SPEC parsing

The nla_for_each_nested parsing in function i40e_ndo_bridge_setlink()
does not check the length of the attribute. This can lead to an
out-of-attribute read and allow a malformed nlattr (e.g., length 0) to
be viewed as a 2 byte integer.

This patch adds the check based on nla_len() just as other code does,
see how bnxt_bridge_setlink (drivers/net/ethernet/broadcom/bnxt/bnxt.c)
parses IFLA_AF_SPEC: type checking plus length checking.

Fixes: 51616018dd1b ("i40e: Add support for getlink, setlink ndo ops")
Signed-off-by: Lin Ma <linma@....edu.cn>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 29ad1797adce..6363357bdeeb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -13186,6 +13186,9 @@ static int i40e_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) &&
 		    (mode != BRIDGE_MODE_VEB))
-- 
2.17.1