| From 6f7f657f24405f426212c09260bf7fe8a52cef33 Mon Sep 17 00:00:00 2001 |
| From: Alexander Aring <aahringo@redhat.com> |
| Date: Sun, 28 Feb 2021 10:18:03 -0500 |
| Subject: net: ieee802154: nl-mac: fix check on panid |
| |
| From: Alexander Aring <aahringo@redhat.com> |
| |
| commit 6f7f657f24405f426212c09260bf7fe8a52cef33 upstream. |
| |
| 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> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| net/ieee802154/nl-mac.c | 7 ++++--- |
| 1 file changed, 4 insertions(+), 3 deletions(-) |
| |
| --- a/net/ieee802154/nl-mac.c |
| +++ b/net/ieee802154/nl-mac.c |
| @@ -559,9 +559,7 @@ ieee802154_llsec_parse_key_id(struct gen |
| 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]); |
| @@ -570,6 +568,9 @@ ieee802154_llsec_parse_key_id(struct gen |
| 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]); |
| } |
