linux-kernel - [PATCH AUTOSEL 4.9 08/74] mm/cma.c: fix crash on CMA allocation if bitmap allocation fails

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Date:   Sat,  1 Jun 2019 09:23:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yue Hu <huyue2@...ong.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Laura Abbott <labbott@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-mm@...ck.org
Subject: [PATCH AUTOSEL 4.9 08/74] mm/cma.c: fix crash on CMA allocation if bitmap allocation fails

From: Yue Hu <huyue2@...ong.com>

[ Upstream commit 1df3a339074e31db95c4790ea9236874b13ccd87 ]

f022d8cb7ec7 ("mm: cma: Don't crash on allocation if CMA area can't be
activated") fixes the crash issue when activation fails via setting
cma->count as 0, same logic exists if bitmap allocation fails.

Link: http://lkml.kernel.org/r/20190325081309.6004-1-zbestahu@gmail.com
Signed-off-by: Yue Hu <huyue2@...ong.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 mm/cma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/cma.c b/mm/cma.c
index b5d8847497a3e..4ea0f32761c1a 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -100,8 +100,10 @@ static int __init cma_activate_area(struct cma *cma)
 
 	cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
 
-	if (!cma->bitmap)
+	if (!cma->bitmap) {
+		cma->count = 0;
 		return -ENOMEM;
+	}
 
 	WARN_ON_ONCE(!pfn_valid(pfn));
 	zone = page_zone(pfn_to_page(pfn));
-- 
2.20.1