From: Alexander Aring aahringo@redhat.com
[ Upstream commit 37feaaf5ceb2245e474369312bb7b922ce7bce69 ]
This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_KEY is not set by the user. If this is the case nl802154 will return -EINVAL.
Reported-by: syzbot+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com Signed-off-by: Alexander Aring aahringo@redhat.com Link: https://lore.kernel.org/r/20210221174321.14210-1-aahringo@redhat.com Signed-off-by: Stefan Schmidt stefan@datenfreihafen.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 ffcfcef76291..44df73d73fc9 100644 --- a/net/ieee802154/nl802154.c +++ b/net/ieee802154/nl802154.c @@ -1608,7 +1608,8 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info) struct nlattr *attrs[NL802154_KEY_ATTR_MAX + 1]; struct ieee802154_llsec_key_id id;
- if (nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack)) + if (!info->attrs[NL802154_ATTR_SEC_KEY] || + nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack)) return -EINVAL;
if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0)