netdev - [PATCH] hv/netvsc: Fix NULL dereference at single queue mode fallback

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Message-Id: <20180814171050.26356-1-tiwai@suse.de>
Date:   Tue, 14 Aug 2018 19:10:50 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Stephen Hemminger <sthemmin@...rosoft.com>
Cc:     "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "David S . Miller" <davem@...emloft.net>,
        devel@...uxdriverproject.org, netdev@...r.kernel.org
Subject: [PATCH] hv/netvsc: Fix NULL dereference at single queue mode fallback

The recent commit 916c5e1413be ("hv/netvsc: fix handling of fallback
to single queue mode") tried to fix the fallback behavior to a single
queue mode, but it changed the function to return zero incorrectly,
while the function should return an object pointer.  Eventually this
leads to a NULL dereference at the callers that expect non-NULL
value.

Fix it by returning the proper net_device object.

Fixes: 916c5e1413be ("hv/netvsc: fix handling of fallback to single queue mode")
Cc: <stable@...r.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/net/hyperv/rndis_filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 408ece27131c..2a5209f23f29 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -1338,7 +1338,7 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
 	/* setting up multiple channels failed */
 	net_device->max_chn = 1;
 	net_device->num_chn = 1;
-	return 0;
+	return net_device;
 
 err_dev_remv:
 	rndis_filter_device_remove(dev, net_device);
-- 
2.18.0