USB: EHCI: declare hostpc register as zero-length array

The HOSTPC extension registers found in some EHCI implementations form
a variable-length array, with one element for each port.  Therefore
the hostpc field in struct ehci_regs should be declared as a
zero-length array, not a single-element array.

This fixes a problem reported by UBSAN.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Wilfried Klaebe <linux-kernel@lebenslange-mailadresse.de>
Tested-by: Wilfried Klaebe <linux-kernel@lebenslange-mailadresse.de>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h
index 966889a20ea3..e479033bd782 100644
--- a/include/linux/usb/ehci_def.h
+++ b/include/linux/usb/ehci_def.h
@@ -180,11 +180,11 @@ struct ehci_regs {
  * PORTSCx
  */
         /* HOSTPC: offset 0x84 */
-        u32             hostpc[1];      /* HOSTPC extension */
+        u32             hostpc[0];      /* HOSTPC extension */
 #define HOSTPC_PHCD     (1<<22)         /* Phy clock disable */
 #define HOSTPC_PSPD     (3<<25)         /* Port speed detection */
 
-        u32             reserved5[16];
+        u32             reserved5[17];
 
         /* USBMODE_EX: offset 0xc8 */
         u32             usbmode_ex;     /* USB Device mode extension */