CVE-2022-50243

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sctp: handle the error returned from sctp_auth_asoc_init_active_key<br /> <br /> When it returns an error from sctp_auth_asoc_init_active_key(), the<br /> active_key is actually not updated. The old sh_key will be freeed<br /> while it&amp;#39;s still used as active key in asoc. Then an use-after-free<br /> will be triggered when sending patckets, as found by syzbot:<br /> <br /> sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112<br /> sctp_set_owner_w net/sctp/socket.c:132 [inline]<br /> sctp_sendmsg_to_asoc+0xbd5/0x1a20 net/sctp/socket.c:1863<br /> sctp_sendmsg+0x1053/0x1d50 net/sctp/socket.c:2025<br /> inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819<br /> sock_sendmsg_nosec net/socket.c:714 [inline]<br /> sock_sendmsg+0xcf/0x120 net/socket.c:734<br /> <br /> This patch is to fix it by not replacing the sh_key when it returns<br /> errors from sctp_auth_asoc_init_active_key() in sctp_auth_set_key().<br /> For sctp_auth_set_active_key(), old active_key_id will be set back<br /> to asoc-&gt;active_key_id when the same thing happens.