linux-kernel - [PATCH 4.19 40/40] mm/vmalloc.c: move area->pages after if statement

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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;