From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Mon, 14 Nov 2022 22:30:39 +0000 (-0500)
Subject: NFS: Fix an Oops in nfs_d_automount()
X-Git-Tag: v6.1.8~1536
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6f3d56783fbed861e483736a7001bdafd0dddd53;p=platform%2Fkernel%2Flinux-starfive.git

NFS: Fix an Oops in nfs_d_automount()

[ Upstream commit 35e3b6ae84935d0d7ff76cbdaa83411b0ad5e471 ]

When mounting from a NFSv4 referral, path->dentry can end up being a
negative dentry, so derive the struct nfs_server from the dentry
itself instead.

Fixes: 2b0143b5c986 ("VFS: normal filesystems (and lustre): d_inode() annotations")
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 2f336ac..88a23af 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -147,7 +147,7 @@ struct vfsmount *nfs_d_automount(struct path *path)
 	struct nfs_fs_context *ctx;
 	struct fs_context *fc;
 	struct vfsmount *mnt = ERR_PTR(-ENOMEM);
-	struct nfs_server *server = NFS_SERVER(d_inode(path->dentry));
+	struct nfs_server *server = NFS_SB(path->dentry->d_sb);
 	struct nfs_client *client = server->nfs_client;
 	int timeout = READ_ONCE(nfs_mountpoint_expiry_timeout);
 	int ret;