Patch "Fix user namespace leak" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    Fix user namespace leak

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fix-user-namespace-leak.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ee8e7a9dd256b9251ddb72fa8b3879e319b06a40
Author: Alexey Gladkov <legion@xxxxxxxxxx>
Date:   Thu Oct 14 18:02:30 2021 +0200

    Fix user namespace leak
    
    [ Upstream commit d5f458a979650e5ed37212f6134e4ee2b28cb6ed ]
    
    Fixes: 61ca2c4afd9d ("NFS: Only reference user namespace from nfs4idmap struct instead of cred")
    Signed-off-by: Alexey Gladkov <legion@xxxxxxxxxx>
    Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
index 8d8aba305ecca..f331866dd4182 100644
--- a/fs/nfs/nfs4idmap.c
+++ b/fs/nfs/nfs4idmap.c
@@ -487,7 +487,7 @@ nfs_idmap_new(struct nfs_client *clp)
 err_destroy_pipe:
 	rpc_destroy_pipe_data(idmap->idmap_pipe);
 err:
-	get_user_ns(idmap->user_ns);
+	put_user_ns(idmap->user_ns);
 	kfree(idmap);
 	return error;
 }