[MOD] STR #4100: libusb-based USB backend: usblp_attached field of printer data structure can stay uninitialized

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[STR New]

If open_device() errors out early, before detaching the usblp kernel
module, close_device() can get called with printer->usblp_attached
uninitialized.

Patch with the fix is attached.

Link: http://www.cups.org/str.php?L4100
Version: 1.5.3

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--- a/backend/usb-libusb.c
+++ b/backend/usb-libusb.c
@@ -1098,6 +1098,8 @@
   if (libusb_open(printer->device, &printer->handle) < 0)
     return (-1);
 
+  printer->usblp_attached = 0;
+
   if (verbose)
     fputs("STATE: +connecting-to-device\n", stderr);