FAILED: patch "[PATCH] fuse: reject internal errno" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to [off-list ref].

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 49221cf86d18bb66fe95d3338cb33bd4b9880ca5 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <redacted>
Date: Tue, 22 Jun 2021 09:15:35 +0200
Subject: [PATCH] fuse: reject internal errno

Don't allow userspace to report errors that could be kernel-internal.

Reported-by: Anatoly Trosinenko <redacted>
Fixes: 334f485df85a ("[PATCH] FUSE - device functions")
Cc: <redacted> # v2.6.14
Signed-off-by: Miklos Szeredi <redacted>

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 6e63bcba2a40..b8d58aa08206 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c

@@ -1867,7 +1867,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 	}
 
 	err = -EINVAL;
-	if (oh.error <= -1000 || oh.error > 0)
+	if (oh.error <= -512 || oh.error > 0)
 		goto copy_finish;
 
 	spin_lock(&fpq->lock);