USB: xhci: Fail gracefully if there's no SS ep companion descriptor.
This is a work around for a bug in the SuperSpeed Endpoint Companion Descriptor
parsing code. It fails in some corner cases, which means ep->ss_ep_comp may be
NULL.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 075e103..41aca00 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -496,7 +496,12 @@
max_packet = ep->desc.wMaxPacketSize;
ep_ctx->ep_info2 |= MAX_PACKET(max_packet);
/* dig out max burst from ep companion desc */
- max_packet = ep->ss_ep_comp->desc.bMaxBurst;
+ if (!ep->ss_ep_comp) {
+ xhci_warn(xhci, "WARN no SS endpoint companion descriptor.\n");
+ max_packet = 0;
+ } else {
+ max_packet = ep->ss_ep_comp->desc.bMaxBurst;
+ }
ep_ctx->ep_info2 |= MAX_BURST(max_packet);
break;
case USB_SPEED_HIGH: