linux-kernel - [PATCHv3 1/2] usb: gadget: storage: strict coversion of 'ro' parameter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 15 Jul 2010 12:07:20 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Shevchenko <ext-andriy.shevchenko@...ia.com>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org
Subject: [PATCHv3 1/2] usb: gadget: storage: strict coversion of 'ro' parameter

Bring a strict way to get the 'ro' parameter from the user.
The idea was discussed in LKML [1].

[1] http://lkml.org/lkml/2010/7/13/143

Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@...ia.com>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Cc: linux-usb@...r.kernel.org
---
 drivers/usb/gadget/storage_common.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 04c462f..7123929 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -723,9 +723,9 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
 	ssize_t		rc = count;
 	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
 	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
-	int		i;
+	unsigned long	ro;
 
-	if (sscanf(buf, "%d", &i) != 1)
+	if (strict_strtoul(buf, 2, &ro))
 		return -EINVAL;
 
 	/* Allow the write-enable status to change only while the backing file
@@ -735,8 +735,8 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
 		LDBG(curlun, "read-only status change prevented\n");
 		rc = -EBUSY;
 	} else {
-		curlun->ro = !!i;
-		curlun->initially_ro = !!i;
+		curlun->ro = ro;
+		curlun->initially_ro = ro;
 		LDBG(curlun, "read-only status set to %d\n", curlun->ro);
 	}
 	up_read(filesem);
-- 
1.6.3.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/