netdev - [PATCH net-next 01/14] nfp: return -EOPNOTSUPP from .ndo_get_phys_port

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Message-Id: <20180526045338.10993-2-jakub.kicinski@netronome.com>
Date:   Fri, 25 May 2018 21:53:25 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     jiri@...nulli.us, xiyou.wangcong@...il.com,
        john.fastabend@...il.com, netdev@...r.kernel.org,
        oss-drivers@...ronome.com, alexei.starovoitov@...il.com,
        nogahf@...lanox.com, yuvalm@...lanox.com, gerlitz.or@...il.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 01/14] nfp: return -EOPNOTSUPP from .ndo_get_phys_port_name for VFs

After recent change we started returning 0 from
ndo_get_phys_port_name for VFs.  The name parameter for
ndo_get_phys_port_name is not initialized by the stack so
this can lead to a crash.  We should have kept returning
-EOPNOTSUPP in the first place.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index eea11e881bf5..1f572896d1ee 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3286,11 +3286,12 @@ nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
 	if (nn->port)
 		return nfp_port_get_phys_port_name(netdev, name, len);
 
-	if (!nn->dp.is_vf) {
-		n = snprintf(name, len, "%d", nn->id);
-		if (n >= len)
-			return -EINVAL;
-	}
+	if (nn->dp.is_vf)
+		return -EOPNOTSUPP;
+
+	n = snprintf(name, len, "%d", nn->id);
+	if (n >= len)
+		return -EINVAL;
 
 	return 0;
 }
-- 
2.17.0