[PATCH 4.4 084/113] fs/cifs: dont translate SFM_SLASH (U+F026) to backslash

From: Greg Kroah-Hartman
Date: Mon Oct 08 2018 - 14:36:33 EST


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

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

From: Jon Kuhn <jkuhn@xxxxxxxxxxxxx>

[ Upstream commit c15e3f19a6d5c89b1209dc94b40e568177cb0921 ]

When a Mac client saves an item containing a backslash to a file server
the backslash is represented in the CIFS/SMB protocol as as U+F026.
Before this change, listing a directory containing an item with a
backslash in its name will return that item with the backslash
represented with a true backslash character (U+005C) because
convert_sfm_character mapped U+F026 to U+005C when interpretting the
CIFS/SMB protocol response. However, attempting to open or stat the
path using a true backslash will result in an error because
convert_to_sfm_char does not map U+005C back to U+F026 causing the
CIFS/SMB request to be made with the backslash represented as U+005C.

This change simply prevents the U+F026 to U+005C conversion from
happenning. This is analogous to how the code does not do any
translation of UNI_SLASH (U+F000).

Signed-off-by: Jon Kuhn <jkuhn@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/cifs_unicode.c | 3 ---
1 file changed, 3 deletions(-)

--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -101,9 +101,6 @@ convert_sfm_char(const __u16 src_char, c
case SFM_LESSTHAN:
*target = '<';
break;
- case SFM_SLASH:
- *target = '\\';
- break;
case SFM_SPACE:
*target = ' ';
break;