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- Fix lock dependency cycle in rpz zone config setup.

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W.C.A. Wijngaards 2020-07-17 17:15:55 +02:00
parent 7d4445c03d
commit b7b5952c3a
2 changed files with 18 additions and 1 deletions
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1
doc/Changelog
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@ -1,6 +1,7 @@
17 July 2020: Wouter
- Fix libnettle compile for session ticket key callback function
changes.
- Fix lock dependency cycle in rpz zone config setup.
17 July 2020: Ralph
- Merge PR #234 - Ensure proper alignment of cmsg buffers by Jérémie

18
services/authzone.c
View file

@ -1866,15 +1866,26 @@ auth_zones_cfg(struct auth_zones* az, struct config_auth* c)
struct auth_xfer* x = NULL;
/* create zone */
if(c->isrpz) {
/* if the rpz lock is needed, grab it before the other
* locks to avoid a lock dependency cycle */
lock_rw_wrlock(&az->rpz_lock);
}
lock_rw_wrlock(&az->lock);
if(!(z=auth_zones_find_or_add_zone(az, c->name))) {
lock_rw_unlock(&az->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
if(c->masters || c->urls) {
if(!(x=auth_zones_find_or_add_xfer(az, z))) {
lock_rw_unlock(&az->lock);
lock_rw_unlock(&z->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
}
@ -1889,6 +1900,9 @@ auth_zones_cfg(struct auth_zones* az, struct config_auth* c)
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&z->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
z->for_downstream = c->for_downstream;
@ -1900,11 +1914,13 @@ auth_zones_cfg(struct auth_zones* az, struct config_auth* c)
return 0;
}
lock_protect(&z->lock, &z->rpz->local_zones, sizeof(*z->rpz));
lock_rw_wrlock(&az->rpz_lock);
/* the az->rpz_lock is locked above */
z->rpz_az_next = az->rpz_first;
if(az->rpz_first)
az->rpz_first->rpz_az_prev = z;
az->rpz_first = z;
}
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}