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mod_proxy: fix proxy connection cleanup from an n+2 pool.

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When connection_destructor() is called after pchild is gone, we can't
dereference worker->cp anymore. This happens is debug/one_process mode only,
if we exit by calling apr_terminate() or clearing the process pool directly.

Fix this by NULL-ing worker->cp in conn_pool_cleanup(), and by registering it
as a pre_cleanup.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1822531 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yann Ylavic
2018-01-29 16:41:03 +00:00
parent c75bda95cc
commit 2baf370c0a
1 changed files with 4 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
modules/proxy/proxy_util.c
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@@ -1306,10 +1306,7 @@ static void socket_cleanup(proxy_conn_rec *conn)
static apr_status_t conn_pool_cleanup(void *theworker)
{
proxy_worker *worker = (proxy_worker *)theworker;
if (worker->cp->res) {
worker->cp->pool = NULL;
}
((proxy_worker *)theworker)->cp = NULL;
return APR_SUCCESS;
}
@@ -1347,14 +1344,6 @@ static apr_status_t connection_cleanup(void *theconn)
proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
proxy_worker *worker = conn->worker;
/*
* If the connection pool is NULL the worker
* cleanup has been run. Just return.
*/
if (!worker->cp->pool) {
return APR_SUCCESS;
}
if (conn->r) {
apr_pool_destroy(conn->r->pool);
conn->r = NULL;
@@ -1476,7 +1465,7 @@ static apr_status_t connection_destructor(void *resource, void *params,
proxy_worker *worker = params;
/* Destroy the pool only if not called from reslist_destroy */
if (worker->cp->pool) {
if (worker->cp) {
proxy_conn_rec *conn = resource;
apr_pool_destroy(conn->pool);
}
@@ -1907,9 +1896,8 @@ PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker, ser
connection_constructor, connection_destructor,
worker, worker->cp->pool);
apr_pool_cleanup_register(worker->cp->pool, (void *)worker,
conn_pool_cleanup,
apr_pool_cleanup_null);
apr_pool_pre_cleanup_register(worker->cp->pool, worker,
conn_pool_cleanup);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00930)
"initialized pool in child %" APR_PID_T_FMT " for (%s) min=%d max=%d smax=%d",