This is a note to let you know that I've just added the patch titled
memblock, memhotplug: fix wrong type in memblock_find_in_range_node().
to the 3.16-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:
memblock-memhotplug-fix-wrong-type-in-memblock_find_in_range_node.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0cfb8f0c3e21e36d4a6e472e4c419d58ba848698 Mon Sep 17 00:00:00 2001
From: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Date: Fri, 29 Aug 2014 15:18:31 -0700
Subject: memblock, memhotplug: fix wrong type in memblock_find_in_range_node().
From: Tang Chen <tangchen@xxxxxxxxxxxxxx>
commit 0cfb8f0c3e21e36d4a6e472e4c419d58ba848698 upstream.
In memblock_find_in_range_node(), we defined ret as int. But it should
be phys_addr_t because it is used to store the return value from
__memblock_find_range_bottom_up().
The bug has not been triggered because when allocating low memory near
the kernel end, the "int ret" won't turn out to be negative. When we
started to allocate memory on other nodes, and the "int ret" could be
minus. Then the kernel will panic.
A simple way to reproduce this: comment out the following code in
numa_init(),
memblock_set_bottom_up(false);
and the kernel won't boot.
Reported-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Tested-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memblock.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -192,8 +192,7 @@ phys_addr_t __init_memblock memblock_fin
phys_addr_t align, phys_addr_t start,
phys_addr_t end, int nid)
{
- int ret;
- phys_addr_t kernel_end;
+ phys_addr_t kernel_end, ret;
/* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
Patches currently in stable-queue which might be from tangchen@xxxxxxxxxxxxxx are
queue-3.16/memblock-memhotplug-fix-wrong-type-in-memblock_find_in_range_node.patch
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