[Qemu-devel] [PATCH 06/14] usb-linux: Ensure devep != 0

[Hans de Goede <hdegoede@redhat.com>]

So that we don't index endp_table with a negative index.
---
 usb-linux.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/usb-linux.c b/usb-linux.c
index 544aea3..e2f45d3 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -1029,6 +1029,11 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
             }
 
             devep = descriptors[i + 2];
+            if ((devep & 0x0f) == 0) {
+                fprintf(stderr, "usb-linux: invalid ep descriptor, ep == 0\n");
+                return 1;
+            }
+
             switch (descriptors[i + 3] & 0x3) {
             case 0x00:
                 type = USBDEVFS_URB_TYPE_CONTROL;
-- 
1.7.5.1