USB: core: Avoid WARNings for 0-length descriptor requests

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>

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 30e9e68..4d59d92 100644 (file)
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -783,6 +783,9 @@ 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) {
@@ -832,6 +835,9 @@ 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),