From: Yue Hu <huy...@yulong.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-zbest...@gmail.com
Signed-off-by: Yue Hu <huy...@yulong.com>
Reviewed-by: Anshuman Khandual <anshuman.khand...@arm.com>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Cc: Laura Abbott <labb...@redhat.com>
Cc: Mike Rapoport <r...@linux.vnet.ibm.com>
Cc: Randy Dunlap <rdun...@infradead.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
mm/cma.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/cma.c b/mm/cma.c
index f4f3a8a57d862..f160ce31ef469 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -106,8 +106,10 @@ 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
