From: Miklos Szeredi mszeredi@redhat.com
stable inclusion from linux-4.19.149 commit 59da76a1713f7fd82d9c18ec72be99085b557027
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[ Upstream commit 32f98877c57bee6bc27f443a96f49678a2cd6a50 ]
page_count() is unstable. Unless there has been an RCU grace period between when the page was removed from the page cache and now, a speculative reference may exist from the page cache.
Reported-by: Matthew Wilcox willy@infradead.org Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/fuse/dev.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 01e6ea11822b..c51c9a6881e4 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -831,7 +831,6 @@ static int fuse_check_page(struct page *page) { if (page_mapcount(page) || page->mapping != NULL || - page_count(page) != 1 || (page->flags & PAGE_FLAGS_CHECK_AT_PREP & ~(1 << PG_locked | 1 << PG_referenced |