usb-linux: Ensure devep != 0

So that we don't index endp_table with a negative index. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2011-05-31 11:35:22 +02:00 · 2011-05-31 11:35:22 +02:00 · 130314f83d
commit 130314f83d
parent 61c1117f08
1 changed files with 5 additions and 0 deletions
--- 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;