[PATCH 4.4 27/38] net: ieee802154: nl-mac: fix check on panid

[Greg Kroah-Hartman]

From: Alexander Aring <aahringo@xxxxxxxxxx>

commit 6f7f657f24405f426212c09260bf7fe8a52cef33 upstream.

This patch fixes a null pointer derefence for panid handle by move the
check for the netlink variable directly before accessing them.

Reported-by: syzbot+d4c07de0144f6f63be3a@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210228151817.95700-4-aahringo@xxxxxxxxxx
Signed-off-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ieee802154/nl-mac.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/net/ieee802154/nl-mac.c
+++ b/net/ieee802154/nl-mac.c
@@ -557,9 +557,7 @@ ieee802154_llsec_parse_key_id(struct gen
 	desc->mode = nla_get_u8(info->attrs[IEEE802154_ATTR_LLSEC_KEY_MODE]);
 
 	if (desc->mode == IEEE802154_SCF_KEY_IMPLICIT) {
-		if (!info->attrs[IEEE802154_ATTR_PAN_ID] &&
-		    !(info->attrs[IEEE802154_ATTR_SHORT_ADDR] ||
-		      info->attrs[IEEE802154_ATTR_HW_ADDR]))
+		if (!info->attrs[IEEE802154_ATTR_PAN_ID])
 			return -EINVAL;
 
 		desc->device_addr.pan_id = nla_get_shortaddr(info->attrs[IEEE802154_ATTR_PAN_ID]);
@@ -568,6 +566,9 @@ ieee802154_llsec_parse_key_id(struct gen
 			desc->device_addr.mode = IEEE802154_ADDR_SHORT;
 			desc->device_addr.short_addr = nla_get_shortaddr(info->attrs[IEEE802154_ATTR_SHORT_ADDR]);
 		} else {
+			if (!info->attrs[IEEE802154_ATTR_HW_ADDR])
+				return -EINVAL;
+
 			desc->device_addr.mode = IEEE802154_ADDR_LONG;
 			desc->device_addr.extended_addr = nla_get_hwaddr(info->attrs[IEEE802154_ATTR_HW_ADDR]);
 		}