linux-kernel - [PATCH AUTOSEL 3.18 08/13] fs/cifs: don't translate SFM

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Message-ID: <20180924144959.164754-8-alexander.levin@microsoft.com>
Date:   Mon, 24 Sep 2018 14:50:11 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Jon Kuhn <jkuhn@...racuda.com>,
        Steven French <Steven.French@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 3.18 08/13] fs/cifs: don't translate SFM_SLASH
 (U+F026) to backslash

From: Jon Kuhn <jkuhn@...racuda.com>

[ 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@...racuda.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/cifs/cifs_unicode.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 4c7752639067..a39cb5c01fcf 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -136,9 +136,6 @@ convert_sfm_char(const __u16 src_char, char *target)
 	case SFM_LESSTHAN:
 		*target = '<';
 		break;
-	case SFM_SLASH:
-		*target = '\\';
-		break;
 	case SFM_SPACE:
 		*target = ' ';
 		break;
-- 
2.17.1