linux-kernel - [PATCH 3.2 71/79] usbip: Fix sscanf handling

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Message-ID: <lsq.1518322806.418920876@decadent.org.uk>
Date:   Sun, 11 Feb 2018 04:20:06 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Alan" <gnomes@...rguk.ukuu.org.uk>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Alan Cox" <alan@...ux.intel.com>
Subject: [PATCH 3.2 71/79] usbip: Fix sscanf handling

3.2.99-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alan <gnomes@...rguk.ukuu.org.uk>

commit 2d32927127f44d755780aa5fa88c8c34e72558f8 upstream.

Scan only to the length permitted by the buffer

One of a set of sscanf problems noted by Jackie Chang

Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/usbip/userspace/libsrc/usbip_common.c | 2 +-
 drivers/staging/usbip/userspace/libsrc/vhci_driver.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/staging/usbip/userspace/libsrc/usbip_common.c
+++ b/drivers/staging/usbip/userspace/libsrc/usbip_common.c
@@ -164,7 +164,7 @@ int read_attr_speed(struct sysfs_device
 		goto err;
 	}
 
-	ret = sscanf(attr->value, "%s\n", speed);
+	ret = sscanf(attr->value, "%99s\n", speed);
 	if (ret < 1) {
 		dbg("sscanf failed");
 		goto err;
--- a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c
+++ b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c
@@ -66,7 +66,7 @@ static int parse_status(char *value)
 		unsigned long socket;
 		char lbusid[SYSFS_BUS_ID_SIZE];
 
-		ret = sscanf(c, "%d %d %d %x %lx %s\n",
+		ret = sscanf(c, "%d %d %d %x %lx %31s\n",
 				&port, &status, &speed,
 				&devid, &socket, lbusid);