linux-kernel - [PATCH] mm/vmalloc: move 'area->pages' after if statement

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Date:   Fri, 30 Aug 2019 12:57:16 +0900
From:   Austin Kim <austindh.kim@...il.com>
To:     akpm@...ux-foundation.org, urezki@...il.com, guro@...com,
        rpenyaev@...e.de, mhocko@...e.com, rick.p.edgecombe@...el.com,
        rppt@...ux.ibm.com, aryabinin@...tuozzo.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        austindh.kim@...il.com
Subject: [PATCH] mm/vmalloc: move 'area->pages' after if statement

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.

Signed-off-by: Austin Kim <austindh.kim@...il.com>
---
 mm/vmalloc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b810103..af93ba6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2416,13 +2416,15 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	} 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;
+
 	for (i = 0; i < area->nr_pages; i++) {
 		struct page *page;
 
-- 
2.6.2