[PATCH AUTOSEL 5.4 33/63] USB: core: Avoid WARNings for 0-length descriptor requests

[PATCH AUTOSEL 5.4 33/63] USB: core: Avoid WARNings for 0-length descriptor requests

[Sasha Levin]

From: Alan Stern <stern@rowland.harvard.edu>

[ Upstream commit 60dfe484cef45293e631b3a6e8995f1689818172 ]

The USB core has utility routines to retrieve various types of
descriptors.  These routines will now provoke a WARN if they are asked
to retrieve 0 bytes (USB "receive" requests must not have zero
length), so avert this by checking the size argument at the start.

CC: Johan Hovold <johan@kernel.org>
Reported-and-tested-by: syzbot+7dbcd9ff34dc4ed45240@syzkaller.appspotmail.com
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210607152307.GD1768031@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/core/message.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 041c68ea329f..7ca908704777 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -647,6 +647,9 @@ int usb_get_descriptor(struct usb_device *dev, unsigned char type,
 	int i;
 	int result;
 
+	if (size <= 0)		/* No point in asking for no data */
+		return -EINVAL;
+
 	memset(buf, 0, size);	/* Make sure we parse really received data */
 
 	for (i = 0; i < 3; ++i) {
@@ -695,6 +698,9 @@ static int usb_get_string(struct usb_device *dev, unsigned short langid,
 	int i;
 	int result;
 
+	if (size <= 0)		/* No point in asking for no data */
+		return -EINVAL;
+
 	for (i = 0; i < 3; ++i) {
 		/* retry on length 0 or stall; some devices are flakey */
 		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-- 
2.30.2

[PATCH AUTOSEL 5.4 52/63] usb: gadget: f_hid: fix endianness issue with descriptors

[Sasha Levin]

From: Ruslan Bilovol <ruslan.bilovol@gmail.com>

[ Upstream commit 33cb46c4676d01956811b68a29157ea969a5df70 ]

Running sparse checker it shows warning message about
incorrect endianness used for descriptor initialization:

| f_hid.c:91:43: warning: incorrect type in initializer (different base types)
| f_hid.c:91:43:    expected restricted __le16 [usertype] bcdHID
| f_hid.c:91:43:    got int

Fixing issue with cpu_to_le16() macro, however this is not a real issue
as the value is the same both endians.

Cc: Fabien Chouteau <fabien.chouteau@barco.com>
Cc: Segiy Stetsyuk <serg_stetsuk@ukr.net>
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Link: https://lore.kernel.org/r/20210617162755.29676-1-ruslan.bilovol@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/gadget/function/f_hid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index 0586229ac83d..3d540b0d9368 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -88,7 +88,7 @@ static struct usb_interface_descriptor hidg_interface_desc = {
 static struct hid_descriptor hidg_desc = {
 	.bLength			= sizeof hidg_desc,
 	.bDescriptorType		= HID_DT_HID,
-	.bcdHID				= 0x0101,
+	.bcdHID				= cpu_to_le16(0x0101),
 	.bCountryCode			= 0x00,
 	.bNumDescriptors		= 0x1,
 	/*.desc[0].bDescriptorType	= DYNAMIC */
-- 
2.30.2

[PATCH AUTOSEL 5.4 53/63] usb: gadget: hid: fix error return code in hid_bind()

[Sasha Levin]

From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit 88693f770bb09c196b1eb5f06a484a254ecb9924 ]

Fix to return a negative error code from the error handling
case instead of 0.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210618043835.2641360-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/gadget/legacy/hid.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/legacy/hid.c b/drivers/usb/gadget/legacy/hid.c
index c4eda7fe7ab4..5b27d289443f 100644
--- a/drivers/usb/gadget/legacy/hid.c
+++ b/drivers/usb/gadget/legacy/hid.c
@@ -171,8 +171,10 @@ static int hid_bind(struct usb_composite_dev *cdev)
 		struct usb_descriptor_header *usb_desc;
 
 		usb_desc = usb_otg_descriptor_alloc(gadget);
-		if (!usb_desc)
+		if (!usb_desc) {
+			status = -ENOMEM;
 			goto put;
+		}
 		usb_otg_descriptor_init(gadget, usb_desc);
 		otg_desc[0] = usb_desc;
 		otg_desc[1] = NULL;
-- 
2.30.2