Staging: hv: mousevsc: Handle the case where we may get bogus report …

…desc size

Handle the case where we may get bogus report desc size from the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/hv_mouse.c

@@ -341,6 +341,8 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 
 	/* Save the report desc */
 	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
+	if (input_device->report_desc_size == 0)
+		goto cleanup;
 	input_device->report_desc = kzalloc(input_device->report_desc_size,
 					  GFP_ATOMIC);