<p>Richard Mudgett has uploaded this change for <strong>review</strong>.</p><p><a href="https://gerrit.asterisk.org/7152">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">res_pjsip_registrar.c: Fix AOR and pjproject group deadlock.<br><br>One of the patches for ASTERISK_27147 introduced a deadlock regression.<br>When the connection oriented transport shut down, the code attempted to<br>remove the associated contact.  However, that same transport had just<br>requested a registration that we hadn't responded to yet.  Depending<br>upon timing we could deadlock.<br><br>* Made send the REGISTER response after we completed processing the<br>request contacts and released the AOR lock to avoid the deadlock.<br><br>ASTERISK-27391<br><br>Change-Id: I89a90f87cb7a02facbafb44c75d8845f93417364<br>---<br>M res/res_pjsip_registrar.c<br>1 file changed, 37 insertions(+), 19 deletions(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/52/7152/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">diff --git a/res/res_pjsip_registrar.c b/res/res_pjsip_registrar.c<br>index 3290601..f0da6de 100644<br>--- a/res/res_pjsip_registrar.c<br>+++ b/res/res_pjsip_registrar.c<br>@@ -447,11 +447,19 @@<br>     AST_VECTOR_FREE(&contact_vec);<br> }<br> <br>-static int register_aor_core(pjsip_rx_data *rdata,<br>+struct aor_core_response {<br>+  /*! Tx data to use for statefull response.  NULL for stateless response. */<br>+  pjsip_tx_data *tdata;<br>+        /*! SIP response code to send in stateless response */<br>+       int code;<br>+};<br>+<br>+static void register_aor_core(pjsip_rx_data *rdata,<br>       struct ast_sip_endpoint *endpoint,<br>    struct ast_sip_aor *aor,<br>      const char *aor_name,<br>-        struct ao2_container *contacts)<br>+      struct ao2_container *contacts,<br>+      struct aor_core_response *response)<br> {<br>       static const pj_str_t USER_AGENT = { "User-Agent", 10 };<br> <br>@@ -480,19 +488,19 @@<br> <br>       if (registrar_validate_contacts(rdata, contacts, aor, &added, &updated, &deleted)) {<br>              /* The provided Contact headers do not conform to the specification */<br>-               pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 400, NULL, NULL, NULL);<br>            ast_sip_report_failed_acl(endpoint, rdata, "registrar_invalid_contacts_provided");<br>          ast_log(LOG_WARNING, "Failed to validate contacts in REGISTER request from '%s'\n",<br>                                 ast_sorcery_object_get_id(endpoint));<br>-                return PJ_TRUE;<br>+              response->code = 400;<br>+             return;<br>       }<br> <br>  if (registrar_validate_path(rdata, aor, &path_str)) {<br>             /* Ensure that intervening proxies did not make invalid modifications to the request */<br>-              pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 420, NULL, NULL, NULL);<br>            ast_log(LOG_WARNING, "Invalid modifications made to REGISTER request from '%s' by intervening proxy\n",<br>                             ast_sorcery_object_get_id(endpoint));<br>-                return PJ_TRUE;<br>+              response->code = 420;<br>+             return;<br>       }<br> <br>  if (aor->remove_existing) {<br>@@ -504,18 +512,18 @@<br>         }<br>     if (contact_count > aor->max_contacts) {<br>                /* Enforce the maximum number of contacts */<br>-         pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);<br>            ast_sip_report_failed_acl(endpoint, rdata, "registrar_attempt_exceeds_maximum_configured_contacts");<br>                ast_log(LOG_WARNING, "Registration attempt from endpoint '%s' to AOR '%s' will exceed max contacts of %u\n",<br>                                ast_sorcery_object_get_id(endpoint), aor_name, aor->max_contacts);<br>-                return PJ_TRUE;<br>+              response->code = 403;<br>+             return;<br>       }<br> <br>  details.pool = pjsip_endpt_create_pool(ast_sip_get_pjsip_endpoint(),<br>          "Contact Comparison", 256, 256);<br>    if (!details.pool) {<br>-         pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);<br>-           return PJ_TRUE;<br>+              response->code = 500;<br>+             return;<br>       }<br> <br>  user_agent_hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &USER_AGENT, NULL);<br>@@ -730,8 +738,8 @@<br>      /* Re-retrieve contacts.  Caller will clean up the original container. */<br>     contacts = ast_sip_location_retrieve_aor_contacts_nolock(aor);<br>        if (!contacts) {<br>-             pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);<br>-           return PJ_TRUE;<br>+              response->code = 500;<br>+             return;<br>       }<br>     response_contact = ao2_callback(contacts, 0, NULL, NULL);<br> <br>@@ -739,7 +747,8 @@<br>     if (ast_sip_create_response(rdata, 200, response_contact, &tdata) != PJ_SUCCESS) {<br>                ao2_cleanup(response_contact);<br>                ao2_cleanup(contacts);<br>-               return PJ_TRUE;<br>+              response->code = 500;<br>+             return;<br>       }<br>     ao2_cleanup(response_contact);<br> <br>@@ -754,9 +763,7 @@<br>                pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr*)expires_hdr);<br>    }<br> <br>- ast_sip_send_stateful_response(rdata, tdata, endpoint);<br>-<br>-   return PJ_TRUE;<br>+      response->tdata = tdata;<br> }<br> <br> static int register_aor(pjsip_rx_data *rdata,<br>@@ -764,21 +771,32 @@<br>     struct ast_sip_aor *aor,<br>      const char *aor_name)<br> {<br>-    int res;<br>+     struct aor_core_response response = {<br>+                .code = 500,<br>+ };<br>    struct ao2_container *contacts = NULL;<br> <br>     ao2_lock(aor);<br>        contacts = ast_sip_location_retrieve_aor_contacts_nolock(aor);<br>        if (!contacts) {<br>              ao2_unlock(aor);<br>+             pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(),<br>+                  rdata, response.code, NULL, NULL, NULL);<br>              return PJ_TRUE;<br>       }<br> <br>- res = register_aor_core(rdata, endpoint, aor, aor_name, contacts);<br>+   register_aor_core(rdata, endpoint, aor, aor_name, contacts, &response);<br>   ao2_cleanup(contacts);<br>        ao2_unlock(aor);<br> <br>-  return res;<br>+  /* Now send the REGISTER response to the peer */<br>+     if (response.tdata) {<br>+                ast_sip_send_stateful_response(rdata, response.tdata, endpoint);<br>+     } else {<br>+             pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(),<br>+                  rdata, response.code, NULL, NULL, NULL);<br>+     }<br>+    return PJ_TRUE;<br> }<br> <br> static int match_aor(const char *aor_name, const char *id)<br></pre><p>To view, visit <a href="https://gerrit.asterisk.org/7152">change 7152</a>. To unsubscribe, visit <a href="https://gerrit.asterisk.org/settings">settings</a>.</p><div itemscope itemtype="http://schema.org/EmailMessage"><div itemscope itemprop="action" itemtype="http://schema.org/ViewAction"><link itemprop="url" href="https://gerrit.asterisk.org/7152"/><meta itemprop="name" content="View Change"/></div></div>

<div style="display:none"> Gerrit-Project: asterisk </div>
<div style="display:none"> Gerrit-Branch: 14.7 </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>
<div style="display:none"> Gerrit-Change-Id: I89a90f87cb7a02facbafb44c75d8845f93417364 </div>
<div style="display:none"> Gerrit-Change-Number: 7152 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: Richard Mudgett <rmudgett@digium.com> </div>