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From: Pradeep P V K <>
	Pradeep P V K <>
Subject: [PATCH V1] fuse: Set fuse request error upon fuse abort connection
Date: Fri, 16 Apr 2021 19:49:12 +0530	[thread overview]
Message-ID: <> (raw)

There is a minor race in setting the fuse out request error
between fuse_abort_conn() and fuse_dev_do_read() as explained

Thread-1			  Thread-2
========			  ========
->fuse_simple_request()           ->shutdown
    ->queue_request()		->fuse_abort_conn()
->fuse_dev_do_read()                ->acquire(fpq->lock)
  ->wait_for(fpq->lock) 	  ->set err to all req's in fpq->io
  ->add req to fpq->io

The above scenario may cause Thread-1 request to add into
fpq->io list after Thread-2 sets -ECONNABORTED err to all
its requests in fpq->io list. This leaves Thread-1 request
with unset err and this further misleads as a completed
request without an err set upon request_end().

Handle this by setting the err appropriately.

Signed-off-by: Pradeep P V K <>
 fs/fuse/dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index a5ceccc..102c56f 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1283,6 +1283,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 	clear_bit(FR_LOCKED, &req->flags);
 	if (!fpq->connected) {
 		err = fc->aborted ? -ECONNABORTED : -ENODEV;
+		req->out.h.error = err;
 		goto out_end;
 	if (err) {

             reply	other threads:[~2021-04-16 14:19 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 14:19 Pradeep P V K [this message]
2021-05-10  7:52 ` pragalla
2021-05-10 14:05   ` Miklos Szeredi
2021-06-21  7:48 ` Miklos Szeredi

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