From 3a9677b791bb866bef538ebeb8d77d76adac536d Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 19 May 2020 14:50:37 +0200 Subject: [PATCH] fuse: don't check refcount after stealing page [ 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 Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/fuse/dev.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index b99225e11712..f0129c033bd6 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -825,7 +825,6 @@ 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 | -- 2.20.1