diff options
| -rw-r--r-- | drivers/isdn/isdnloop/isdnloop.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c index bf4168bb0ca0..4267d48fe0b3 100644 --- a/drivers/isdn/isdnloop/isdnloop.c +++ b/drivers/isdn/isdnloop/isdnloop.c @@ -1071,6 +1071,12 @@ isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp) return -EBUSY; if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef))) return -EFAULT; + + for (i = 0; i < 3; i++) { + if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i]))) + return -EINVAL; + } + spin_lock_irqsave(&card->isdnloop_lock, flags); switch (sdef.ptype) { case ISDN_PTYPE_EURO: |