x86/kaslr: Fix incorrect i8254 outb() parameters

BugLink: https://bugs.launchpad.net/bugs/1837664
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>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/arch/x86/lib/kaslr.c b/arch/x86/lib/kaslr.c
index 79778ab200e494c16cac7441cdb5da9507940715..a536651164584c96a19b1455f743834291a355c6 100644 (file)
--- a/arch/x86/lib/kaslr.c
+++ b/arch/x86/lib/kaslr.c
@@ -36,8 +36,8 @@ 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;