Patch "powerpc/nvram: Fix an incorrect partition merge" has been added to the 4.8-stable tree

Patch "powerpc/nvram: Fix an incorrect partition merge" has been added to the 4.8-stable tree

[gregkh]

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

    powerpc/nvram: Fix an incorrect partition merge

to the 4.8-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:
     powerpc-nvram-fix-an-incorrect-partition-merge.patch
and it can be found in the queue-4.8 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 11b7e154b132232535befe51c55db048069c8461 Mon Sep 17 00:00:00 2001
From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Date: Thu, 10 Dec 2015 15:30:02 +0800
Subject: powerpc/nvram: Fix an incorrect partition merge

From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>

commit 11b7e154b132232535befe51c55db048069c8461 upstream.

When we merge two contiguous partitions whose signatures are marked
NVRAM_SIG_FREE, We need update prev's length and checksum, then write it
to nvram, not cur's. So lets fix this mistake now.

Also use memset instead of strncpy to set the partition's name. It's
more readable if we want to fill up with duplicate chars .

Fixes: fa2b4e54d41f ("powerpc/nvram: Improve partition removal")
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kernel/nvram_64.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -956,7 +956,7 @@ int __init nvram_remove_partition(const
 
 		/* Make partition a free partition */
 		part->header.signature = NVRAM_SIG_FREE;
-		strncpy(part->header.name, "wwwwwwwwwwww", 12);
+		memset(part->header.name, 'w', 12);
 		part->header.checksum = nvram_checksum(&part->header);
 		rc = nvram_write_header(part);
 		if (rc <= 0) {
@@ -974,8 +974,8 @@ int __init nvram_remove_partition(const
 		}
 		if (prev) {
 			prev->header.length += part->header.length;
-			prev->header.checksum = nvram_checksum(&part->header);
-			rc = nvram_write_header(part);
+			prev->header.checksum = nvram_checksum(&prev->header);
+			rc = nvram_write_header(prev);
 			if (rc <= 0) {
 				printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
 				return rc;


Patches currently in stable-queue which might be from xinhui.pan@linux.vnet.ibm.com are

queue-4.8/powerpc-nvram-fix-an-incorrect-partition-merge.patch