sctp: move the active_key update after sh_keys is added

In commit 58acd1009226 ("sctp: update active_key for asoc when old key is
being replaced"), sctp_auth_asoc_init_active_key() is called to update
the active_key right after the old key is deleted and before the new key
is added, and it caused that the active_key could be found with the key_id.

In Ying Xu's testing, the BUG_ON in sctp_auth_asoc_init_active_key() was
triggered:

  [ ] kernel BUG at net/sctp/auth.c:416!
  [ ] RIP: 0010:sctp_auth_asoc_init_active_key.part.8+0xe7/0xf0 [sctp]
  [ ] Call Trace:
  [ ]  sctp_auth_set_key+0x16d/0x1b0 [sctp]
  [ ]  sctp_setsockopt.part.33+0x1ba9/0x2bd0 [sctp]
  [ ]  __sys_setsockopt+0xd6/0x1d0
  [ ]  __x64_sys_setsockopt+0x20/0x30
  [ ]  do_syscall_64+0x5b/0x1a0

So fix it by moving the active_key update after sh_keys is added.

Fixes: 58acd1009226 ("sctp: update active_key for asoc when old key is being replaced")
Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index fe74c5f..db6b737 100644 (file)
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -857,14 +857,18 @@ int sctp_auth_set_key(struct sctp_endpoint *ep,
        memcpy(key->data, &auth_key->sca_key[0], auth_key->sca_keylength);
        cur_key->key = key;
 
-       if (replace) {
-               list_del_init(&shkey->key_list);
-               sctp_auth_shkey_release(shkey);
-               if (asoc && asoc->active_key_id == auth_key->sca_keynumber)
-                       sctp_auth_asoc_init_active_key(asoc, GFP_KERNEL);
+       if (!replace) {
+               list_add(&cur_key->key_list, sh_keys);
+               return 0;
        }
+
+       list_del_init(&shkey->key_list);
+       sctp_auth_shkey_release(shkey);
        list_add(&cur_key->key_list, sh_keys);
 
+       if (asoc && asoc->active_key_id == auth_key->sca_keynumber)
+               sctp_auth_asoc_init_active_key(asoc, GFP_KERNEL);
+
        return 0;
 }