linux-kernel - [PATCH 4.19 093/118] cifs: Fix separator when building path from dentry

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Message-Id: <20181211151648.026520102@linuxfoundation.org>
Date:   Tue, 11 Dec 2018 16:41:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paulo Alcantara <palcantara@...e.com>,
        Aurelien Aptel <aaptel@...e.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 4.19 093/118] cifs: Fix separator when building path from dentry

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paulo Alcantara <palcantara@...e.com>

commit c988de29ca161823db6a7125e803d597ef75b49c upstream.

Make sure to use the CIFS_DIR_SEP(cifs_sb) as path separator for
prefixpath too. Fixes a bug with smb1 UNIX extensions.

Fixes: a6b5058fafdf ("fs/cifs: make share unaccessible at root level mountable")
Signed-off-by: Paulo Alcantara <palcantara@...e.com>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/dir.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -174,7 +174,7 @@ cifs_bp_rename_retry:
 
 		cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
 		memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
-		full_path[dfsplen] = '\\';
+		full_path[dfsplen] = dirsep;
 		for (i = 0; i < pplen-1; i++)
 			if (full_path[dfsplen+1+i] == '/')
 				full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);