[qpid-dispatch] branch master updated: DISPATCH-1362 - Remove recursive call to qdr_check_addr_CT during core shutdown. This removes a window of opportunity for an invalid free during shutdown. This closes #519

[tross]

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tross pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/qpid-dispatch.git


The following commit(s) were added to refs/heads/master by this push:
     new 2d42c9c  DISPATCH-1362 - Remove recursive call to qdr_check_addr_CT 
during core shutdown.  This removes a window of opportunity for an invalid free 
during shutdown. This closes #519
2d42c9c is described below

commit 2d42c9c645934332f1e5262fa4fa1a1cf9a30a37
Author: Ted Ross <tr...@redhat.com>
AuthorDate: Mon Jun 10 16:05:37 2019 -0400

    DISPATCH-1362 - Remove recursive call to qdr_check_addr_CT during core 
shutdown.  This removes a window of opportunity for an invalid free during 
shutdown.
    This closes #519
---
 src/router_core/connections.c | 8 ++++++++
 src/router_core/router_core.c | 9 ++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/router_core/connections.c b/src/router_core/connections.c
index 01f4175..e62e609 100644
--- a/src/router_core/connections.c
+++ b/src/router_core/connections.c
@@ -1173,7 +1173,15 @@ void qdr_check_addr_CT(qdr_core_t *core, qdr_address_t 
*addr)
         && addr->tracked_deliveries == 0
         && addr->core_endpoint == 0
         && addr->fallback_for == 0) {
+        qdr_address_t *fallback = addr->fallback;
         qdr_core_remove_address(core, addr);
+
+        //
+        // If the address being removed had a fallback address, check to see 
if that
+        // address should now also be removed.
+        //
+        if (!!fallback)
+            qdr_check_addr_CT(core, fallback);
     }
 }
 
diff --git a/src/router_core/router_core.c b/src/router_core/router_core.c
index aaab696..67c145e 100644
--- a/src/router_core/router_core.c
+++ b/src/router_core/router_core.c
@@ -519,10 +519,13 @@ void qdr_core_remove_address(qdr_core_t *core, 
qdr_address_t *addr)
         cr = DEQ_HEAD(addr->conns);
     }
 
-    if (!!addr->fallback) {
+    //
+    // If there are any fallback-related linkages, disconnect them.
+    //
+    if (!!addr->fallback)
         addr->fallback->fallback_for = 0;
-        qdr_check_addr_CT(core, addr->fallback);
-    }
+    if (!!addr->fallback_for)
+        addr->fallback_for->fallback = 0;
 
     free(addr->add_prefix);
     free(addr->del_prefix);


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