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net: ieee802154: nl-mac: fix check on panid

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This patch fixes a null pointer derefence for panid handle by move the
check for the netlink variable directly before accessing them.

Reported-by: syzbot+d4c07de0144f6f63be3a@syzkaller.appspotmail.com
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20210228151817.95700-4-aahringo@redhat.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
This commit is contained in:
Alexander Aring 2021-02-28 10:18:03 -05:00 committed by Stefan Schmidt
parent 27c746869e
commit 6f7f657f24
1 changed files with 4 additions and 3 deletions
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7
net/ieee802154/nl-mac.c
View File

@ -551,9 +551,7 @@ ieee802154_llsec_parse_key_id(struct genl_info *info,
desc->mode = nla_get_u8(info->attrs[IEEE802154_ATTR_LLSEC_KEY_MODE]);
if (desc->mode == IEEE802154_SCF_KEY_IMPLICIT) {
if (!info->attrs[IEEE802154_ATTR_PAN_ID] &&
!(info->attrs[IEEE802154_ATTR_SHORT_ADDR] ||
info->attrs[IEEE802154_ATTR_HW_ADDR]))
if (!info->attrs[IEEE802154_ATTR_PAN_ID])
return -EINVAL;
desc->device_addr.pan_id = nla_get_shortaddr(info->attrs[IEEE802154_ATTR_PAN_ID]);
@ -562,6 +560,9 @@ ieee802154_llsec_parse_key_id(struct genl_info *info,
desc->device_addr.mode = IEEE802154_ADDR_SHORT;
desc->device_addr.short_addr = nla_get_shortaddr(info->attrs[IEEE802154_ATTR_SHORT_ADDR]);
} else {
if (!info->attrs[IEEE802154_ATTR_HW_ADDR])
return -EINVAL;
desc->device_addr.mode = IEEE802154_ADDR_LONG;
desc->device_addr.extended_addr = nla_get_hwaddr(info->attrs[IEEE802154_ATTR_HW_ADDR]);
}