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    Subject[PATCH 4.4 33/38] net: ieee802154: forbid monitor for del llsec seclevel
    Date
    From: Alexander Aring <aahringo@redhat.com>

    commit 9dde130937e95b72adfae64ab21d6e7e707e2dac upstream.

    This patch forbids to del llsec seclevel for monitor interfaces which we
    don't support yet. Otherwise we will access llsec mib which isn't
    initialized for monitors.

    Reported-by: syzbot+fbf4fc11a819824e027b@syzkaller.appspotmail.com
    Signed-off-by: Alexander Aring <aahringo@redhat.com>
    Link: https://lore.kernel.org/r/20210405003054.256017-15-aahringo@redhat.com
    Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/ieee802154/nl802154.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/net/ieee802154/nl802154.c
    +++ b/net/ieee802154/nl802154.c
    @@ -2087,6 +2087,9 @@ static int nl802154_del_llsec_seclevel(s
    struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
    struct ieee802154_llsec_seclevel sl;

    + if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
    + return -EOPNOTSUPP;
    +
    if (!info->attrs[NL802154_ATTR_SEC_LEVEL] ||
    llsec_parse_seclevel(info->attrs[NL802154_ATTR_SEC_LEVEL],
    &sl) < 0)

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