Description of problem: Fix possible memory overrun issue in the isdn ioctl code. The 1 snprintf() can be overflown by people who also use the ioctl. It however can only overwrite other parts of the iocpar union, no return pointers. This issue public via: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=eafe1aa37e6ec2d56f14732b5240c4dd09f0613a The above link also includes the proposed patch. Note: This issue is different than that one described in: https://bugzilla.redhat.com/show_bug.cgi?id=392101 which is also I4L kernel ISDN code related.