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fuse: set FR_SENT while locked
Otherwise fuse_dev_do_write() could come in and finish off the request, and
the set_bit(FR_SENT, ...) could trigger the WARN_ON(test_bit(FR_SENT, ...))
in request_end().
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Reported-by: syzbot+ef054c4d3f64cd7f7cec@syzkaller.appspotmai
Fixes: 46c34a348b
("fuse: no fc->lock for pqueue parts")
Cc: <stable@vger.kernel.org> # v4.2
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@ -1312,8 +1312,8 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
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}
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list_move_tail(&req->list, &fpq->processing);
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__fuse_get_request(req);
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spin_unlock(&fpq->lock);
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set_bit(FR_SENT, &req->flags);
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spin_unlock(&fpq->lock);
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/* matches barrier in request_wait_answer() */
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smp_mb__after_atomic();
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if (test_bit(FR_INTERRUPTED, &req->flags))
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