Re: [syzbot] [netfs?] KASAN: slab-use-after-free Read in netfs_unbuffered_write

[Edward Adam Davis]

#syz test

diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
index 25f8ceb15fad..8af58e4937c8 100644
--- a/fs/netfs/direct_write.c
+++ b/fs/netfs/direct_write.c
@@ -115,8 +115,11 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq)
 
 		/* Check if (re-)preparation failed. */
 		if (unlikely(test_bit(NETFS_SREQ_FAILED, &subreq->flags))) {
-			netfs_write_subrequest_terminated(subreq, subreq->error);
+			if (!stream->construct)
+				netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit);
 			wreq->error = subreq->error;
+			netfs_write_subrequest_terminated(subreq, subreq->error);
+			ret = wreq->error;
 			break;
 		}