[PATCH] ksmbd: use kasprintf() in ksmbd_vfs_xattr_stream_name()

From: Dan Carpenter <dan.carpenter@oracle.com>
To: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
	Steve French <sfrench@samba.org>,
	Hyunchul Lee <hyc.lee@gmail.com>,
	linux-cifs@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] ksmbd: use kasprintf() in ksmbd_vfs_xattr_stream_name()
Date: Wed, 7 Jul 2021 13:15:32 +0300	[thread overview]
Message-ID: <YOV+xDbnpDrR/Ipj@mwanda> (raw)

Simplify the code by using kasprintf().  This also silences a Smatch
warning:

    fs/ksmbd/vfs.c:1725 ksmbd_vfs_xattr_stream_name()
    warn: inconsistent indenting

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Not tested.

 fs/ksmbd/vfs.c | 27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)

diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index 0f5a4fb8215f..d3bab9235e9a 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -1697,35 +1697,20 @@ ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
 				size_t *xattr_stream_name_size, int s_type)
 {
-	int stream_name_size;
-	char *xattr_stream_name_buf;
-	char *type;
-	int type_len;
+	char *type, *buf;
 
 	if (s_type == DIR_STREAM)
 		type = ":$INDEX_ALLOCATION";
 	else
 		type = ":$DATA";
 
-	type_len = strlen(type);
-	stream_name_size = strlen(stream_name);
-	*xattr_stream_name_size = stream_name_size + XATTR_NAME_STREAM_LEN + 1;
-	xattr_stream_name_buf = kmalloc(*xattr_stream_name_size + type_len,
-					GFP_KERNEL);
-	if (!xattr_stream_name_buf)
+	buf = kasprintf(GFP_KERNEL, "%s%s%s",
+			XATTR_NAME_STREAM, stream_name,	type);
+	if (!buf)
 		return -ENOMEM;
 
-	memcpy(xattr_stream_name_buf, XATTR_NAME_STREAM, XATTR_NAME_STREAM_LEN);
-
-	if (stream_name_size) {
-		memcpy(&xattr_stream_name_buf[XATTR_NAME_STREAM_LEN],
-		       stream_name, stream_name_size);
-	}
-	memcpy(&xattr_stream_name_buf[*xattr_stream_name_size - 1], type, type_len);
-		*xattr_stream_name_size += type_len;
-
-	xattr_stream_name_buf[*xattr_stream_name_size - 1] = '\0';
-	*xattr_stream_name = xattr_stream_name_buf;
+	*xattr_stream_name = buf;
+	*xattr_stream_name_size = strlen(buf) + 1;
 
 	return 0;
 }
-- 
2.30.2

