[PATCH 4.14 37/50] rndis_host: set proper input size for OID_GEN_PHYSICAL_MEDIUM request

From: Greg Kroah-Hartman
Date: Fri Jan 22 2021 - 13:58:38 EST

From: Andrey Zhizhikin <andrey.zhizhikin@xxxxxxxxxxxxxxxxxxxx>

[ Upstream commit e56b3d94d939f52d46209b9e1b6700c5bfff3123 ]

MSFT ActiveSync implementation requires that the size of the response for
incoming query is to be provided in the request input length. Failure to
set the input size proper results in failed request transfer, where the
ActiveSync counterpart reports the NDIS_STATUS_INVALID_LENGTH (0xC0010014L)

Set the input size for OID_GEN_PHYSICAL_MEDIUM query to the expected size
of the response in order for the ActiveSync to properly respond to the

Fixes: 039ee17d1baa ("rndis_host: Add RNDIS physical medium checking into generic_rndis_bind()")
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210108095839.3335-1-andrey.zhizhikin@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/usb/rndis_host.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/rndis_host.c
+++ b/drivers/net/usb/rndis_host.c
@@ -399,7 +399,7 @@ generic_rndis_bind(struct usbnet *dev, s
reply_len = sizeof *phym;
retval = rndis_query(dev, intf, u.buf,
- 0, (void **) &phym, &reply_len);
+ reply_len, (void **)&phym, &reply_len);
if (retval != 0 || !phym) {
/* OID is optional so don't fail here. */
phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);