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Message-Id: <20200420121508.076569623@linuxfoundation.org>
Date: Mon, 20 Apr 2020 14:39:50 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Austin Kim <austindh.kim@...il.com>,
Michal Hocko <mhocko@...e.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Uladzislau Rezki (Sony)" <urezki@...il.com>,
Roman Gushchin <guro@...com>, Roman Penyaev <rpenyaev@...e.de>,
Rick Edgecombe <rick.p.edgecombe@...el.com>,
Mike Rapoport <rppt@...ux.ibm.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.19 40/40] mm/vmalloc.c: move area->pages after if statement
From: Austin Kim <austindh.kim@...il.com>
commit 7ea362427c170061b8822dd41bafaa72b3bcb9ad upstream.
If !area->pages statement is true where memory allocation fails, area is
freed.
In this case 'area->pages = pages' should not executed. So move
'area->pages = pages' after if statement.
[akpm@...ux-foundation.org: give area->pages the same treatment]
Link: http://lkml.kernel.org/r/20190830035716.GA190684@LGEARND20B15
Signed-off-by: Austin Kim <austindh.kim@...il.com>
Acked-by: Michal Hocko <mhocko@...e.com>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: Uladzislau Rezki (Sony) <urezki@...il.com>
Cc: Roman Gushchin <guro@...com>
Cc: Roman Penyaev <rpenyaev@...e.de>
Cc: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
mm/vmalloc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1668,7 +1668,6 @@ static void *__vmalloc_area_node(struct
nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
array_size = (nr_pages * sizeof(struct page *));
- area->nr_pages = nr_pages;
/* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask,
@@ -1676,13 +1675,16 @@ static void *__vmalloc_area_node(struct
} else {
pages = kmalloc_node(array_size, nested_gfp, node);
}
- area->pages = pages;
- if (!area->pages) {
+
+ if (!pages) {
remove_vm_area(area->addr);
kfree(area);
return NULL;
}
+ area->pages = pages;
+ area->nr_pages = nr_pages;
+
for (i = 0; i < area->nr_pages; i++) {
struct page *page;
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