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mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype

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commit 053cfda102 upstream.

If it's not prepared to free unref page, the pcp page migratetype is
unset.  Thus we will get rubbish from get_pcppage_migratetype() and
might list_del(&page->lru) again after it's already deleted from the list
leading to grumble about data corruption.

Link: https://lkml.kernel.org/r/20210902115447.57050-1-linmiaohe@huawei.com
Fixes: df1acc8569 ("mm/page_alloc: avoid conflating IRQs disabled with zone->lock")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miaohe Lin 2021-09-08 18:10:11 -07:00 • committed by Greg Kroah-Hartman
parent d8f8f8c8f3
commit 40298f33aa
1 changed files with 3 additions and 1 deletions
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4
mm/page_alloc.c
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@ -3445,8 +3445,10 @@ void free_unref_page_list(struct list_head *list)
/* Prepare pages for freeing */
list_for_each_entry_safe(page, next, list, lru) {
pfn = page_to_pfn(page);
if (!free_unref_page_prepare(page, pfn, 0))
if (!free_unref_page_prepare(page, pfn, 0)) {
list_del(&page->lru);
continue;
}
/*
* Free isolated pages directly to the allocator, see