net: ieee802154: fix null deref in parse dev addr
Fix a logic error that could result in a null deref if the user sets
the mode incorrectly for the given addr type.
Signed-off-by: Dan Robertson <[email protected]>
Acked-by: Alexander Aring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stefan Schmidt <[email protected]>
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 05f6bd8..0cf2374 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1298,19 +1298,20 @@ ieee802154_llsec_parse_dev_addr(struct nlattr *nla,
if (!nla || nla_parse_nested_deprecated(attrs, NL802154_DEV_ADDR_ATTR_MAX, nla, nl802154_dev_addr_policy, NULL))
return -EINVAL;
- if (!attrs[NL802154_DEV_ADDR_ATTR_PAN_ID] ||
- !attrs[NL802154_DEV_ADDR_ATTR_MODE] ||
- !(attrs[NL802154_DEV_ADDR_ATTR_SHORT] ||
- attrs[NL802154_DEV_ADDR_ATTR_EXTENDED]))
+ if (!attrs[NL802154_DEV_ADDR_ATTR_PAN_ID] || !attrs[NL802154_DEV_ADDR_ATTR_MODE])
return -EINVAL;
addr->pan_id = nla_get_le16(attrs[NL802154_DEV_ADDR_ATTR_PAN_ID]);
addr->mode = nla_get_u32(attrs[NL802154_DEV_ADDR_ATTR_MODE]);
switch (addr->mode) {
case NL802154_DEV_ADDR_SHORT:
+ if (!attrs[NL802154_DEV_ADDR_ATTR_SHORT])
+ return -EINVAL;
addr->short_addr = nla_get_le16(attrs[NL802154_DEV_ADDR_ATTR_SHORT]);
break;
case NL802154_DEV_ADDR_EXTENDED:
+ if (!attrs[NL802154_DEV_ADDR_ATTR_EXTENDED])
+ return -EINVAL;
addr->extended_addr = nla_get_le64(attrs[NL802154_DEV_ADDR_ATTR_EXTENDED]);
break;
default:
