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mm: page_alloc: validate buddy before check its migratetype.

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Whenever a buddy page is found, page_is_buddy() should be called to
check its validity.  Add the missing check during pageblock merge check.

Fixes: 1dd214b8f2 ("mm: page_alloc: avoid merging non-fallbackable pageblocks with others")
Link: https://lore.kernel.org/all/20220330154208.71aca532@gandalf.local.home/
Reported-and-tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zi Yan 2022-03-30 15:45:43 -07:00 committed by Linus Torvalds
parent d5fd43bac8
commit 787af64d05
1 changed files with 3 additions and 0 deletions
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3
mm/page_alloc.c
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@ -1108,6 +1108,9 @@ continue_merging:
buddy_pfn = __find_buddy_pfn(pfn, order);
buddy = page + (buddy_pfn - pfn);
if (!page_is_buddy(page, buddy, order))
goto done_merging;
buddy_mt = get_pageblock_migratetype(buddy);
if (migratetype != buddy_mt