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hv_netvsc: fix bogus ifalias on network device

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If the guest network adapter is not configured with DeviceNaming
enabled on the host, then the query for friendly name will return
success but with a zero length name. Which then leads to a garbage value
(stack contents) for ifalias.

Fix is simple, just don't set name if  host doesn't return it.

Fixes: 0fe554a46a0f ("hv_netvsc: propogate Hyper-V friendly name into interface alias")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2018-05-23 18:02:00 -07:00 committed by David S. Miller
parent de0a8267e2
commit d97cde6ab5
1 changed files with 4 additions and 1 deletions
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5
drivers/net/hyperv/rndis_filter.c
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@ -1237,7 +1237,10 @@ static void rndis_get_friendly_name(struct net_device *net,
if (rndis_filter_query_device(rndis_device, net_device,
RNDIS_OID_GEN_FRIENDLY_NAME,
wname, &size) != 0)
return;
return; /* ignore if host does not support */
if (size == 0)
return; /* name not set */
/* Convert Windows Unicode string to UTF-8 */
len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));