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-rw-r--r--net/irda/af_irda.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c
index a6de3059746d..c9890e25cd4c 100644
--- a/net/irda/af_irda.c
+++ b/net/irda/af_irda.c
@@ -2280,6 +2280,16 @@ 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) {
+ err = -EINVAL;
+ goto out;
+ }
+
/* Ask lmp for the current discovery log */
discoveries = irlmp_get_discoveries(&list.len, self->mask.word,
self->nslots);
@@ -2290,15 +2300,9 @@ static int irda_getsockopt(struct socket *sock, int level, int optname,
}
/* 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) {
err = -EINVAL;