Re: [netfs?] KASAN: slab-use-after-free Write in io_submit_one

[Edward Adam Davis]

#syz test

diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c
index f65affa5a9e4..73fea10d9a78 100644
--- a/fs/netfs/read_collect.c
+++ b/fs/netfs/read_collect.c
@@ -369,12 +369,17 @@ static void netfs_rreq_assess_dio(struct netfs_io_request *rreq)
 		}
 	}
 
+	spin_lock(&rreq->lock);
 	if (rreq->iocb) {
 		rreq->iocb->ki_pos += rreq->transferred;
-		if (rreq->iocb->ki_complete)
+		if (rreq->iocb->ki_complete) {
 			rreq->iocb->ki_complete(
 				rreq->iocb, rreq->error ? rreq->error : rreq->transferred);
+			rreq->iocb = NULL;
+		}
 	}
+	spin_unlock(&rreq->lock);
+
 	if (rreq->netfs_ops->done)
 		rreq->netfs_ops->done(rreq);
 	if (rreq->origin == NETFS_DIO_READ)