Patch "Fix regression which breaks DFS mounting" has been added to the 4.4-stable tree

Patch "Fix regression which breaks DFS mounting" has been added to the 4.4-stable tree

[gregkh]

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

    Fix regression which breaks DFS mounting

to the 4.4-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-regression-which-breaks-dfs-mounting.patch
and it can be found in the queue-4.4 subdirectory.

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


>From d171356ff11ab1825e456dfb979755e01b3c54a1 Mon Sep 17 00:00:00 2001
From: Sachin Prabhu <sprabhu@redhat.com>
Date: Tue, 6 Sep 2016 13:22:34 +0100
Subject: Fix regression which breaks DFS mounting

From: Sachin Prabhu <sprabhu@redhat.com>

commit d171356ff11ab1825e456dfb979755e01b3c54a1 upstream.

Patch a6b5058 results in -EREMOTE returned by is_path_accessible() in
cifs_mount() to be ignored which breaks DFS mounting.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/connect.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3693,14 +3693,16 @@ remote_path_check:
 			goto mount_fail_check;
 		}
 
-		rc = cifs_are_all_path_components_accessible(server,
+		if (rc != -EREMOTE) {
+			rc = cifs_are_all_path_components_accessible(server,
 							     xid, tcon, cifs_sb,
 							     full_path);
-		if (rc != 0) {
-			cifs_dbg(VFS, "cannot query dirs between root and final path, "
-				 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
-			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
-			rc = 0;
+			if (rc != 0) {
+				cifs_dbg(VFS, "cannot query dirs between root and final path, "
+					 "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
+				cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
+				rc = 0;
+			}
 		}
 		kfree(full_path);
 	}


Patches currently in stable-queue which might be from sprabhu@redhat.com are

queue-4.4/fix-regression-which-breaks-dfs-mounting.patch
queue-4.4/cleanup-missing-frees-on-some-ioctls.patch