linux-kernel - [PATCH 4.9 016/109] m68k: fix ColdFire node shift size calculation

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Message-Id: <20171207125636.504788084@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 13:56:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Angelo Dureghello <angelo@...am.it>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 016/109] m68k: fix ColdFire node shift size calculation

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

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

From: Greg Ungerer <gerg@...ux-m68k.org>


[ Upstream commit f55ab8f27548ff3431a6567d400c6757c49fd520 ]

The m68k pg_data_table is a fix size array defined in arch/m68k/mm/init.c.
Index numbers within it are defined based on memory size. But for Coldfire
these don't take into account a non-zero physical RAM base address, and this
causes us to access past the end of this array at system start time.

Change the node shift calculation so that we keep the index inside its range.

Reported-by: Angelo Dureghello <angelo@...am.it>
Tested-by: Angelo Dureghello <angelo@...am.it>
Signed-off-by: Greg Ungerer <gerg@...ux-m68k.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/m68k/mm/mcfmmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/m68k/mm/mcfmmu.c
+++ b/arch/m68k/mm/mcfmmu.c
@@ -169,7 +169,7 @@ void __init cf_bootmem_alloc(void)
 	max_pfn = max_low_pfn = PFN_DOWN(_ramend);
 	high_memory = (void *)_ramend;
 
-	m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
+	m68k_virt_to_node_shift = fls(_ramend - 1) - 6;
 	module_fixup(NULL, __start_fixup, __stop_fixup);
 
 	/* setup bootmem data */