[PATCH 6.10 039/375] fuse: check aborted connection before adding requests to pending list for resending

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joanne Koong <joannelkoong@xxxxxxxxx>

commit 97f30876c94382d1b01d45c2c76be8911b196527 upstream.

There is a race condition where inflight requests will not be aborted if
they are in the middle of being re-sent when the connection is aborted.

If fuse_resend has already moved all the requests in the fpq->processing
lists to its private queue ("to_queue") and then the connection starts
and finishes aborting, these requests will be added to the pending queue
and remain on it indefinitely.

Fixes: 760eac73f9f6 ("fuse: Introduce a new notification type for resend pending requests")
Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.9
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/fuse/dev.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -31,6 +31,8 @@ MODULE_ALIAS("devname:fuse");
 
 static struct kmem_cache *fuse_req_cachep;
 
+static void end_requests(struct list_head *head);
+
 static struct fuse_dev *fuse_get_dev(struct file *file)
 {
 	/*
@@ -1822,6 +1824,13 @@ static void fuse_resend(struct fuse_conn
 	}
 
 	spin_lock(&fiq->lock);
+	if (!fiq->connected) {
+		spin_unlock(&fiq->lock);
+		list_for_each_entry(req, &to_queue, list)
+			clear_bit(FR_PENDING, &req->flags);
+		end_requests(&to_queue);
+		return;
+	}
 	/* iq and pq requests are both oldest to newest */
 	list_splice(&to_queue, &fiq->pending);
 	fiq->ops->wake_pending_and_unlock(fiq);






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