From: Stephen Hemminger Date: Thu, 24 May 2018 01:02:00 +0000 (-0700) Subject: hv_netvsc: fix bogus ifalias on network device X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d97cde6ab547a8115fb4fae73f030a96519ac3c6;p=linux.git hv_netvsc: fix bogus ifalias on network device 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index 7f3dab4b4cbca..5428bb2611026 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -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));