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Subject: [PATCH 4/6] fuse: Check for FR_SENT bit in fuse_dev_do_write()
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     miklos@szeredi.hu, ktkhai@virtuozzo.com,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Date:   Tue, 06 Nov 2018 12:30:49 +0300
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It's not possible to have answer to a request,
before the request is actually sent. Add sanity
check for that.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
 fs/fuse/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 739968ee8b0c..c603f1ebf0fd 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1947,7 +1947,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 		goto err_unlock_pq;
 
 	req = request_find(fpq, oh.unique & ~FUSE_INT_REQ_BIT);
-	if (!req)
+	if (!req || !test_bit(FR_SENT, &req->flags))
 		goto err_unlock_pq;
 
 	/* Is it an interrupt reply ID? */