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mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype
commit053cfda102
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>
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@ -3445,8 +3445,10 @@ void free_unref_page_list(struct list_head *list)
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/* Prepare pages for freeing */
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list_for_each_entry_safe(page, next, list, lru) {
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pfn = page_to_pfn(page);
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if (!free_unref_page_prepare(page, pfn, 0))
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if (!free_unref_page_prepare(page, pfn, 0)) {
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list_del(&page->lru);
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continue;
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}
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/*
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* Free isolated pages directly to the allocator, see
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