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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Daniel Drake <drake@endlessm.com>,
        Thomas Gleixner <tglx@linutronix.de>, bp@alien8.de,
        hpa@zytor.com, linux@endlessm.com
Subject: [PATCH 4.9 32/44] x86/kaslr: Fix incorrect i8254 outb() parameters
Date:   Tue, 29 Jan 2019 12:36:27 +0100
Message-Id: <20190129113142.517091836@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Drake <drake@endlessm.com>

commit 7e6fc2f50a3197d0e82d1c0e86282976c9e6c8a4 upstream.

The outb() function takes parameters value and port, in that order.  Fix
the parameters used in the kalsr i8254 fallback code.

Fixes: 5bfce5ef55cb ("x86, kaslr: Provide randomness functions")
Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Cc: linux@endlessm.com
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20190107034024.15005-1-drake@endlessm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/lib/kaslr.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/lib/kaslr.c
+++ b/arch/x86/lib/kaslr.c
@@ -35,8 +35,8 @@ static inline u16 i8254(void)
 	u16 status, timer;
 
 	do {
-		outb(I8254_PORT_CONTROL,
-		     I8254_CMD_READBACK | I8254_SELECT_COUNTER0);
+		outb(I8254_CMD_READBACK | I8254_SELECT_COUNTER0,
+		     I8254_PORT_CONTROL);
 		status = inb(I8254_PORT_COUNTER0);
 		timer  = inb(I8254_PORT_COUNTER0);
 		timer |= inb(I8254_PORT_COUNTER0) << 8;