linux-kernel - [PATCH 4.9 126/129] CIFS: fix max ea value size

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Message-Id: <20191003154416.814706442@linuxfoundation.org>
Date:   Thu,  3 Oct 2019 17:54:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Murphy Zhou <jencce.kernel@...il.com>,
        Aurelien Aptel <aaptel@...e.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 4.9 126/129] CIFS: fix max ea value size

From: Murphy Zhou <jencce.kernel@...il.com>

commit 63d37fb4ce5ae7bf1e58f906d1bf25f036fe79b2 upstream.

It should not be larger then the slab max buf size. If user
specifies a larger size, it passes this check and goes
straightly to SMB2_set_info_init performing an insecure memcpy.

Signed-off-by: Murphy Zhou <jencce.kernel@...il.com>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -31,7 +31,7 @@
 #include "cifs_fs_sb.h"
 #include "cifs_unicode.h"
 
-#define MAX_EA_VALUE_SIZE 65535
+#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
 #define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
 #define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */
 #define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */