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>

diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h
index 966889a20ea375a29fdba96ab2615babf073e8d5..e479033bd7829148de1a63928c6db99ed91295aa 100644 (file)
--- 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 */