From 6c878a7553680579f287e4659592c0b874fb2377 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Fri, 20 Nov 2015 13:03:39 -0500
Subject: [PATCH] Avoid server crash when worker registration fails at
 execution time.

The previous coding attempts to destroy the DSM in this case, but
child nodes might have stored data there and still be holding onto
pointers in this case.  So don't do that.

Also, free the reader array instead of leaking it.

Extracted from two different patch versions both by Amit Kapila.
---
 src/backend/executor/nodeGather.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/backend/executor/nodeGather.c b/src/backend/executor/nodeGather.c
index b6e82d1664f..f8c1ba637d3 100644
--- a/src/backend/executor/nodeGather.c
+++ b/src/backend/executor/nodeGather.c
@@ -190,7 +190,7 @@ ExecGather(GatherState *node)
 
 			/* No workers?  Then never mind. */
 			if (!got_any_worker)
-				ExecShutdownGather(node);
+				ExecShutdownGatherWorkers(node);
 		}
 
 		/* Run plan locally if no workers or not single-copy. */
@@ -402,6 +402,8 @@ ExecShutdownGatherWorkers(GatherState *node)
 
 		for (i = 0; i < node->nreaders; ++i)
 			DestroyTupleQueueReader(node->reader[i]);
+
+		pfree(node->reader);
 		node->reader = NULL;
 	}
 
-- 
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