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Protect operation when abandoning

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This commit is contained in:
Ondřej Kuzník 2018-03-23 16:19:34 +00:00
parent 07401e5829
commit db939eeb86
1 changed files with 6 additions and 8 deletions
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14
servers/lloadd/operation.c
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@ -610,7 +610,7 @@ operation_abandon( LloadOperation *op )
ldap_pvt_thread_mutex_lock( &op->o_link_mutex );
c = op->o_upstream;
if ( !c ) {
if ( !c || !c->c_live ) {
ldap_pvt_thread_mutex_unlock( &op->o_link_mutex );
goto done;
}
@ -640,6 +640,8 @@ operation_abandon( LloadOperation *op )
}
c->c_n_ops_executing--;
b = (LloadBackend *)c->c_private;
op->o_upstream_refcnt++;
CONNECTION_UNLOCK_INCREF(c);
ldap_pvt_thread_mutex_lock( &b->b_mutex );
@ -652,14 +654,10 @@ operation_abandon( LloadOperation *op )
}
CONNECTION_LOCK_DECREF(c);
op->o_upstream_refcnt--;
unlock:
/*
* FIXME: the dance in operation_destroy_from_upstream might be slower than
* optimal as we've done some of the things above already. However, we want
* to clear o_upstream from the op if it's dying, but witnessing and
* navigating the race to do that safely is too complex to copy here.
*/
if ( !c->c_live ) {
if ( !c->c_live || !op->o_upstream_refcnt ) {
operation_destroy_from_upstream( op );
}
if ( rc ) {