linux-kernel - [PATCH 3.12 57/88] USB: EHCI: declare hostpc register as zero-length array

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Date:	Thu, 14 Jul 2016 10:15:49 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 57/88] USB: EHCI: declare hostpc register as zero-length array

From: Alan Stern <stern@...land.harvard.edu>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 7e8b3dfef16375dbfeb1f36a83eb9f27117c51fd upstream.

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@...land.harvard.edu>
Reported-by: Wilfried Klaebe <linux-kernel@...enslange-mailadresse.de>
Tested-by: Wilfried Klaebe <linux-kernel@...enslange-mailadresse.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/linux/usb/ehci_def.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/usb/ehci_def.h b/include/linux/usb/ehci_def.h
index daec99af5d54..1c88b177cb9c 100644
--- a/include/linux/usb/ehci_def.h
+++ b/include/linux/usb/ehci_def.h
@@ -178,11 +178,11 @@ 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 */
-- 
2.9.1