linux-kernel - [PATCH RFC 1/5] UBIFS: xattr: protect ui_size and data_len by ui

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Message-Id: <1360750998-15191-2-git-send-email-mkl@pengutronix.de>
Date:	Wed, 13 Feb 2013 11:23:14 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	linux-mtd@...ts.infradead.org
Cc:	kernel@...gutronix.de, artem.bityutskiy@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH RFC 1/5] UBIFS: xattr: protect ui_size and data_len by ui_mutex

This patch moves the modification of ui->ui_size and ui->data_len in the
create_xattr() and change_xattr() functions, so that they are protected by the
ui_mutex as stated in the documenation of the the struct ubifs_inode.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 fs/ubifs/xattr.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 0f7139b..1395307 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -143,10 +143,10 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
 		err = -ENOMEM;
 		goto out_free;
 	}
-	inode->i_size = ui->ui_size = size;
-	ui->data_len = size;
 
 	mutex_lock(&host_ui->ui_mutex);
+	inode->i_size = ui->ui_size = size;
+	ui->data_len = size;
 	host->i_ctime = ubifs_current_time(host);
 	host_ui->xattr_cnt += 1;
 	host_ui->xattr_size += CALC_DENT_SIZE(nm->len);
@@ -208,10 +208,10 @@ static int change_xattr(struct ubifs_info *c, struct inode *host,
 		err = -ENOMEM;
 		goto out_free;
 	}
-	inode->i_size = ui->ui_size = size;
-	ui->data_len = size;
 
 	mutex_lock(&host_ui->ui_mutex);
+	inode->i_size = ui->ui_size = size;
+	ui->data_len = size;
 	host->i_ctime = ubifs_current_time(host);
 	host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
 	host_ui->xattr_size += CALC_XATTR_BYTES(size);
-- 
1.7.10.4

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