diff options
| -rw-r--r-- | module/elmcan.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/module/elmcan.c b/module/elmcan.c index 10ca308..538134c 100644 --- a/module/elmcan.c +++ b/module/elmcan.c @@ -1273,13 +1273,15 @@ static int elmcan_ldisc_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { struct elmcan *elm = get_elm(tty); + unsigned int tmp; if (!elm) return -EINVAL; switch (cmd) { case SIOCGIFNAME: - if (copy_to_user((void __user *)arg, elm->dev->name, IFNAMSIZ)) { + tmp = strnlen(elm->dev->name, IFNAMSIZ - 1) + 1; + if (copy_to_user((void __user *)arg, elm->dev->name, tmp)) { put_elm(elm); return -EFAULT; } |