[PATCH] usb.c: warning on USB_MAXINTERFACES overflow

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
 drivers/usb/core/usb.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index b01a797..5dc8afe 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -207,6 +207,16 @@ static int usb_parse_config(struct usb_device *dev, unsigned char *buffer, int c
 			     &buffer[index])->bInterfaceNumber != curr_if_num) {
 				/* this is a new interface, copy new desc */
 				ifno = dev->config.no_of_if;
+				/* if ifno > USB_MAXINTERFACES, then
+				 * next memcpy() will corrupt dev->config
+				 */
+				if (ifno > USB_MAXINTERFACES) {
+					printf("ifno = %d > "
+						"USB_MAXINTERFACES = %d !\n",
+						ifno,
+						USB_MAXINTERFACES);
+					break;
+				}
 				dev->config.no_of_if++;
 				memcpy(&dev->config.if_desc[ifno],
 					&buffer[index], buffer[index]);
-- 
1.7.5.4