1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index dfec5a176315..b93356834bb5 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -949,6 +949,15 @@ static int isr_setup_status_phase(struct ci_hdrc *ci)
         int retval;
         struct ci_hw_ep *hwep;
 
+        /*
+         * Unexpected USB controller behavior, caused by bad signal integrity
+         * or ground reference problems, can lead to isr_setup_status_phase
+         * being called with ci->status equal to NULL.
+         * If this situation occurs, you should review your USB hardware design.
+         */
+        if (WARN_ON_ONCE(!ci->status))
+                return -EPIPE;
+
         hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
         ci->status->context = ci;
         ci->status->complete = isr_setup_status_complete;