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authorMiaohe Lin <linmiaohe@huawei.com>2021-09-09 04:10:11 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-09 04:45:53 +0300
commit053cfda102306a3394012f9fe2594811c34925e4 (patch)
treea256a85bac76787f6cfd6d3759a567e8ce7bd9e4 /mm/page_alloc.c
parent32d4f4b782bb8f0ceb78c6b5dc46eb577ae25bf7 (diff)
downloadlinux-053cfda102306a3394012f9fe2594811c34925e4.tar.xz
mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype
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: df1acc856923 ("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>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index de309a1dfe65..b37435c274cf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3428,8 +3428,10 @@ 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