From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Fri, 28 Nov 2025 23:56:46 +0000 (-0500)
Subject: NFS: Fix up the automount fs_context to use the correct cred
X-Git-Tag: v5.15.198~39
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ef4392495a8620686771aa9f8705de611d36841;p=thirdparty%2Fkernel%2Fstable.git

NFS: Fix up the automount fs_context to use the correct cred

[ Upstream commit a2a8fc27dd668e7562b5326b5ed2f1604cb1e2e9 ]

When automounting, the fs_context should be fixed up to use the cred
from the parent filesystem, since the operation is just extending the
namespace. Authorisation to enter that namespace will already have been
provided by the preceding lookup.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 8fb570fd376a1..6367f067dd7be 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -170,6 +170,11 @@ struct vfsmount *nfs_d_automount(struct path *path)
 	if (!ctx->clone_data.fattr)
 		goto out_fc;
 
+	if (fc->cred != server->cred) {
+		put_cred(fc->cred);
+		fc->cred = get_cred(server->cred);
+	}
+
 	if (fc->net_ns != client->cl_net) {
 		put_net(fc->net_ns);
 		fc->net_ns = get_net(client->cl_net);