Commit 1df3a339 authored May 13, 2019 by Yue Hu Committed by Linus Torvalds May 14, 2019

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

f022d8cb ("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>

parent 113b7dfd

mm/cma.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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));

Admin message