From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Tue, 2 Aug 2011 07:47:17 +0000 (+0300)
Subject: Avoid integer overflow when LIMIT + OFFSET >= 2^63.
X-Git-Tag: REL9_2_BETA1~1338
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=89df948ec26679e09f71baf6bbb9b06f9d329712;p=postgresql

Avoid integer overflow when LIMIT + OFFSET >= 2^63.

This fixes bug #6139 reported by Hitoshi Harada.
---

diff --git a/src/backend/executor/nodeLimit.c b/src/backend/executor/nodeLimit.c
index 85d1a6e27f..f2d356d1f1 100644
--- a/src/backend/executor/nodeLimit.c
+++ b/src/backend/executor/nodeLimit.c
@@ -127,7 +127,7 @@ ExecLimit(LimitState *node)
 				 * the state machine state to record having done so.
 				 */
 				if (!node->noCount &&
-					node->position >= node->offset + node->count)
+					node->position - node->offset >= node->count)
 				{
 					node->lstate = LIMIT_WINDOWEND;
 					return NULL;