From: Dan Robertson Date: Fri, 23 Apr 2021 04:02:13 +0000 (-0400) Subject: net: ieee802154: fix null deref in parse dev addr X-Git-Tag: v4.19.196~108 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5f728ec65485625e30f46e5b4917ff023ad29ea0;p=users%2Fdwmw2%2Flinux.git net: ieee802154: fix null deref in parse dev addr [ Upstream commit 9fdd04918a452980631ecc499317881c1d120b70 ] Fix a logic error that could result in a null deref if the user sets the mode incorrectly for the given addr type. Signed-off-by: Dan Robertson Acked-by: Alexander Aring Link: https://lore.kernel.org/r/20210423040214.15438-2-dan@dlrobertson.com Signed-off-by: Stefan Schmidt Signed-off-by: Sasha Levin --- diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c index b1c55db737648..6d4c71a52b6b2 100644 --- a/net/ieee802154/nl802154.c +++ b/net/ieee802154/nl802154.c @@ -1315,19 +1315,20 @@ ieee802154_llsec_parse_dev_addr(struct nlattr *nla, nl802154_dev_addr_policy, NULL)) return -EINVAL; - if (!attrs[NL802154_DEV_ADDR_ATTR_PAN_ID] || - !attrs[NL802154_DEV_ADDR_ATTR_MODE] || - !(attrs[NL802154_DEV_ADDR_ATTR_SHORT] || - attrs[NL802154_DEV_ADDR_ATTR_EXTENDED])) + if (!attrs[NL802154_DEV_ADDR_ATTR_PAN_ID] || !attrs[NL802154_DEV_ADDR_ATTR_MODE]) return -EINVAL; addr->pan_id = nla_get_le16(attrs[NL802154_DEV_ADDR_ATTR_PAN_ID]); addr->mode = nla_get_u32(attrs[NL802154_DEV_ADDR_ATTR_MODE]); switch (addr->mode) { case NL802154_DEV_ADDR_SHORT: + if (!attrs[NL802154_DEV_ADDR_ATTR_SHORT]) + return -EINVAL; addr->short_addr = nla_get_le16(attrs[NL802154_DEV_ADDR_ATTR_SHORT]); break; case NL802154_DEV_ADDR_EXTENDED: + if (!attrs[NL802154_DEV_ADDR_ATTR_EXTENDED]) + return -EINVAL; addr->extended_addr = nla_get_le64(attrs[NL802154_DEV_ADDR_ATTR_EXTENDED]); break; default: