Re: [PATCH wpan 4/4] net: ieee802154: fix nl802154 del llsec devkey

This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_DEVKEY is
not set by the user. If this is the case nl802154 will return -EINVAL.

Reported-by: syzbot+368672e0da240db53b5f@syzkaller.appspotmail.com
Signed-off-by: Alexander Aring <aahringo@redhat.com>
---
  net/ieee802154/nl802154.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 3f6d86d63923..e9e4652cd592 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c

@@ -1916,7 +1916,8 @@ static int nl802154_del_llsec_devkey(struct sk_buff *skb, struct genl_info *info
  	struct ieee802154_llsec_device_key key;
  	__le64 extended_addr;
  
-	if (nla_parse_nested_deprecated(attrs, NL802154_DEVKEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_DEVKEY], nl802154_devkey_policy, info->extack))
+	if (!info->attrs[NL802154_ATTR_SEC_DEVKEY] ||
+	    nla_parse_nested_deprecated(attrs, NL802154_DEVKEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_DEVKEY], nl802154_devkey_policy, info->extack))
  		return -EINVAL;
  
  	if (!attrs[NL802154_DEVKEY_ATTR_EXTENDED_ADDR])