linux-kernel - [ 038/104] rtnetlink: Mask the rta

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Message-Id: <20130325010528.031723119@decadent.org.uk>
Date:	Mon, 25 Mar 2013 01:06:02 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Vlad Yasevich <vyasevic@...hat.com>,
	Thomas Graf <tgraf@...g.ch>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 038/104] rtnetlink: Mask the rta_type when range checking

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

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

From: Vlad Yasevich <vyasevic@...hat.com>

[ Upstream commit a5b8db91442fce9c9713fcd656c3698f1adde1d6 ]

Range/validity checks on rta_type in rtnetlink_rcv_msg() do
not account for flags that may be set.  This causes the function
to return -EINVAL when flags are set on the type (for example
NLA_F_NESTED).

Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
Acked-by: Thomas Graf <tgraf@...g.ch>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 5229c7f..0cf60eb 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2041,7 +2041,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 		struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
 
 		while (RTA_OK(attr, attrlen)) {
-			unsigned flavor = attr->rta_type;
+			unsigned int flavor = attr->rta_type & NLA_TYPE_MASK;
 			if (flavor) {
 				if (flavor > rta_max[sz_idx])
 					return -EINVAL;


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