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CIFS: fix max ea value size 

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@gmail.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Murphy Zhou 2019-09-21 19:26:00 +08:00 committed by Steve French
parent 8559ad8e89
commit 63d37fb4ce
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/xattr.c
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@ -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 */