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| author | Miklos Szeredi <mszeredi@redhat.com> | 2020-05-19 14:50:37 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-05-19 14:50:37 +0200 |
| commit | 32f98877c57bee6bc27f443a96f49678a2cd6a50 (patch) | |
| tree | 0c4e6a0e64dc7ba0920c961432172518b6aa6b37 /fs/fuse/dev.c | |
| parent | a5005c3cda6eeb6b95645e6cc32f58dafeffc976 (diff) | |
fuse: don't check refcount after stealing page
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>
Diffstat (limited to 'fs/fuse/dev.c')
| -rw-r--r-- | fs/fuse/dev.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index b8962581c699..ec97cabe51ce 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -764,7 +764,6 @@ 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 | |