Patch "m68k: fix ColdFire node shift size calculation" has been added to the 4.9-stable tree

Patch "m68k: fix ColdFire node shift size calculation" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    m68k: fix ColdFire node shift size calculation

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     m68k-fix-coldfire-node-shift-size-calculation.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Dec  6 17:39:55 CET 2017
From: Greg Ungerer <gerg@linux-m68k.org>
Date: Tue, 5 Sep 2017 22:57:06 +1000
Subject: m68k: fix ColdFire node shift size calculation

From: Greg Ungerer <gerg@linux-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@sysam.it>
Tested-by: Angelo Dureghello <angelo@sysam.it>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 */


Patches currently in stable-queue which might be from gerg@linux-m68k.org are

queue-4.9/m68k-fix-coldfire-node-shift-size-calculation.patch