diff options
| -rw-r--r-- | net/irda/af_irda.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c index 10093aab617..7313e1cc1e8 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -2277,6 +2277,14 @@ static int __irda_getsockopt(struct socket *sock, int level, int optname, switch (optname) { case IRLMP_ENUMDEVICES: + + /* Offset to first device entry */ + offset = sizeof(struct irda_device_list) - + sizeof(struct irda_device_info); + + if (len < offset) + return -EINVAL; + /* Ask lmp for the current discovery log */ discoveries = irlmp_get_discoveries(&list.len, self->mask.word, self->nslots); @@ -2286,15 +2294,9 @@ static int __irda_getsockopt(struct socket *sock, int level, int optname, err = 0; /* Write total list length back to client */ - if (copy_to_user(optval, &list, - sizeof(struct irda_device_list) - - sizeof(struct irda_device_info))) + if (copy_to_user(optval, &list, offset)) err = -EFAULT; - /* Offset to first device entry */ - offset = sizeof(struct irda_device_list) - - sizeof(struct irda_device_info); - /* Copy the list itself - watch for overflow */ if(list.len > 2048) { |