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From: Ben Hutchings <ben@decadent.org.uk>
Date: Fri, 20 Jul 2018 01:30:24 +0100
Subject: usbip: Fix misuse of strncpy()
Bug-Debian: https://bugs.debian.org/897802
Forwarded: https://marc.info/?l=linux-usb&m=153213915806258
gcc 8 reports:
usbip_device_driver.c: In function ‘read_usb_vudc_device’:
usbip_device_driver.c:106:2: error: ‘strncpy’ specified bound 256 equals destination size [-Werror=stringop-truncation]
strncpy(dev->path, path, SYSFS_PATH_MAX);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
usbip_device_driver.c:125:2: error: ‘strncpy’ specified bound 32 equals destination size [-Werror=stringop-truncation]
strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I'm not convinced it makes sense to truncate the copied strings here,
but since we're already doing so let's ensure they're still null-
terminated. We can't easily use strlcpy() here, so use snprintf().
usbip_common.c has the same problem.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
Index: linux/tools/usb/usbip/libsrc/usbip_common.c
===================================================================
--- linux.orig/tools/usb/usbip/libsrc/usbip_common.c
+++ linux/tools/usb/usbip/libsrc/usbip_common.c
@@ -226,8 +226,8 @@ int read_usb_device(struct udev_device *
path = udev_device_get_syspath(sdev);
name = udev_device_get_sysname(sdev);
- strncpy(udev->path, path, SYSFS_PATH_MAX);
- strncpy(udev->busid, name, SYSFS_BUS_ID_SIZE);
+ snprintf(udev->path, SYSFS_PATH_MAX, "%s", path);
+ snprintf(udev->busid, SYSFS_BUS_ID_SIZE, "%s", name);
sscanf(name, "%u-%u", &busnum, &devnum);
udev->busnum = busnum;
Index: linux/tools/usb/usbip/libsrc/usbip_device_driver.c
===================================================================
--- linux.orig/tools/usb/usbip/libsrc/usbip_device_driver.c
+++ linux/tools/usb/usbip/libsrc/usbip_device_driver.c
@@ -103,7 +103,7 @@ int read_usb_vudc_device(struct udev_dev
copy_descr_attr16(dev, &descr, idProduct);
copy_descr_attr16(dev, &descr, bcdDevice);
- strncpy(dev->path, path, SYSFS_PATH_MAX);
+ snprintf(dev->path, SYSFS_PATH_MAX, "%s", path);
dev->speed = USB_SPEED_UNKNOWN;
speed = udev_device_get_sysattr_value(sdev, "current_speed");
@@ -122,7 +122,7 @@ int read_usb_vudc_device(struct udev_dev
dev->busnum = 0;
name = udev_device_get_sysname(plat);
- strncpy(dev->busid, name, SYSFS_BUS_ID_SIZE);
+ snprintf(dev->busid, SYSFS_BUS_ID_SIZE, "%s", name);
return 0;
err:
fclose(fd);
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