netdev - [PATCH net 2/2] geneve: use the correct nlattr array in NL_SET_ERR_MSG

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Message-Id: <ba68c6eafb5bf763d9b2188d750867753b900d43.1587568231.git.sd@queasysnail.net>
Date:   Wed, 22 Apr 2020 17:29:51 +0200
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Xin Long <lucien.xin@...il.com>,
        Stefano Brivio <sbrivio@...hat.com>,
        Girish Moodalbail <girish.moodalbail@...cle.com>,
        Matthias Schiffer <mschiffer@...verse-factory.net>,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net 2/2] geneve: use the correct nlattr array in NL_SET_ERR_MSG_ATTR

IFLA_GENEVE_* attributes are in the data array, which is correctly
used when fetching the value, but not when setting the extended
ack. Because IFLA_GENEVE_MAX < IFLA_MAX, we avoid out of bounds
array accesses, but we don't provide a pointer to the invalid
attribute to userspace.

Fixes: a025fb5f49ad ("geneve: Allow configuration of DF behaviour")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 drivers/net/geneve.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 09f279c0182b..6b461be1820b 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1207,7 +1207,7 @@ static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
 		enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
 
 		if (df < 0 || df > GENEVE_DF_MAX) {
-			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
+			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
 					    "Invalid DF attribute");
 			return -EINVAL;
 		}
-- 
2.26.1