diff options
author | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 09:26:38 +0200 |
commit | 7d392674443cb561b2b9161d47198d3428b49d7c (patch) | |
tree | 71b1567f7955c547f38a750e0b7638ca62d6521d /fs/fuse/inode.c | |
parent | eaebcf902ae0260b9f9b5bacdc4530c164ca114f (diff) |
fuse: fix initial parallel dirops
commit 63576c13bd17848376c8ba4a98f5d5151140c4ac upstream.
If parallel dirops are enabled in FUSE_INIT reply, then first operation may
leave fi->mutex held.
Reported-by: syzbot <syzbot+3f7b29af1baa9d0a55be@syzkaller.appspotmail.com>
Fixes: 5c672ab3f0ee ("fuse: serialize dirops by default")
Cc: <stable@vger.kernel.org> # v4.7
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r-- | fs/fuse/inode.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index a13ecefa9cd1..25fdf220d2e9 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -357,15 +357,21 @@ int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, return 0; } -void fuse_lock_inode(struct inode *inode) +bool fuse_lock_inode(struct inode *inode) { - if (!get_fuse_conn(inode)->parallel_dirops) + bool locked = false; + + if (!get_fuse_conn(inode)->parallel_dirops) { mutex_lock(&get_fuse_inode(inode)->mutex); + locked = true; + } + + return locked; } -void fuse_unlock_inode(struct inode *inode) +void fuse_unlock_inode(struct inode *inode, bool locked) { - if (!get_fuse_conn(inode)->parallel_dirops) + if (locked) mutex_unlock(&get_fuse_inode(inode)->mutex); } |