[PATCH wpan 2/4] net: ieee802154: fix nl802154 del llsec dev

[Alexander Aring]

This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_DEVICE is
not set by the user. If this is the case nl802154 will return -EINVAL.

Reported-by: syzbot+d946223c2e751d136...@syzkaller.appspotmail.com
Signed-off-by: Alexander Aring <aahri...@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 2f0a138bd5eb..063b12cba71f 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1758,7 +1758,8 @@ static int nl802154_del_llsec_dev(struct sk_buff *skb, 
struct genl_info *info)
        struct nlattr *attrs[NL802154_DEV_ATTR_MAX + 1];
        __le64 extended_addr;
 
-       if (nla_parse_nested_deprecated(attrs, NL802154_DEV_ATTR_MAX, 
info->attrs[NL802154_ATTR_SEC_DEVICE], nl802154_dev_policy, info->extack))
+       if (!info->attrs[NL802154_ATTR_SEC_DEVICE] ||
+           nla_parse_nested_deprecated(attrs, NL802154_DEV_ATTR_MAX, 
info->attrs[NL802154_ATTR_SEC_DEVICE], nl802154_dev_policy, info->extack))
                return -EINVAL;
 
        if (!attrs[NL802154_DEV_ATTR_EXTENDED_ADDR])
-- 
2.26.2