From: Robert Haas <rhaas@postgresql.org>
Date: Tue, 29 Apr 2014 15:31:41 +0000 (-0400)
Subject: Fix a bug.
X-Git-Url: http://waps.l3s.uni-hannover.de/gitweb/?a=commitdiff_plain;h=25b64c31e81e71df36bf5016af0c072e04d4868f;p=users%2Frhaas%2Fpostgres.git

Fix a bug.
---

diff --git a/src/backend/utils/mmgr/sb_alloc.c b/src/backend/utils/mmgr/sb_alloc.c
index 7b983a4d66..d8923fdca8 100644
--- a/src/backend/utils/mmgr/sb_alloc.c
+++ b/src/backend/utils/mmgr/sb_alloc.c
@@ -341,9 +341,9 @@ sb_free(void *ptr)
 		relptr_store(base, span->prevspan, (sb_span *) NULL);
 		new_nextspan = relptr_access(base,
 									 heap->spans[SB_FULLNESS_CLASSES - 2]);
-		relptr_store(base, new_nextspan->prevspan, span);
-		relptr_copy(heap->spans[SB_FULLNESS_CLASSES - 2],
-					new_nextspan->prevspan);
+		if (new_nextspan != NULL)
+			relptr_store(base, new_nextspan->prevspan, span);
+		relptr_store(base, heap->spans[SB_FULLNESS_CLASSES - 2], span);
 	}
 	else if (span->nallocatable == span->nmax)
 	{