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| author | Miklos Szeredi <mszeredi@redhat.com> | 2020-05-19 14:50:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-01 20:40:13 +0200 |
| commit | 3a9677b791bb866bef538ebeb8d77d76adac536d (patch) | |
| tree | 3a1c4dc804b46027228996f946fd8a51d78c2d4b | |
| parent | 70109a8b5f8a57ac84b9c295187abecc30a2dc33 (diff) | |
| download | linux-stable-3a9677b791bb866bef538ebeb8d77d76adac536d.tar.gz linux-stable-3a9677b791bb866bef538ebeb8d77d76adac536d.tar.bz2 linux-stable-3a9677b791bb866bef538ebeb8d77d76adac536d.zip | |
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 <willy@infradead.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 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 | |