From: Alexander Aring <aahri...@redhat.com> [ Upstream commit 3d1eac2f45585690d942cf47fd7fbd04093ebd1b ]
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> Link: https://lore.kernel.org/r/20210221174321.14210-2-aahri...@redhat.com Signed-off-by: Stefan Schmidt <ste...@datenfreihafen.org> Signed-off-by: Sasha Levin <sas...@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 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]) -- 2.30.2
