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mm/cma.c: fix crash on CMA allocation if bitmap allocation fails 

f022d8cb7e ("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@yulong.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yue Hu 2019-05-13 17:18:14 -07:00 committed by Linus Torvalds
parent 113b7dfd82
commit 1df3a33907
1 changed files with 3 additions and 1 deletions
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4
mm/cma.c
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@ -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));