From d2495f272cd164ff075bee5c4ce95aed11338a36 Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Tue, 15 May 2012 19:22:56 +0300
Subject: [PATCH] Fix bug in to_tsquery().
We were using memcpy() to copy to a possibly overlapping memory region,
which is a no-no. Use memmove() instead.
---
src/backend/tsearch/to_tsany.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/backend/tsearch/to_tsany.c b/src/backend/tsearch/to_tsany.c
index b92a5aa6e5d..da9ae8d5ba8 100644
--- a/src/backend/tsearch/to_tsany.c
+++ b/src/backend/tsearch/to_tsany.c
@@ -340,6 +340,7 @@ to_tsquery_byid(PG_FUNCTION_ARGS)
if (query->size == 0)
PG_RETURN_TSQUERY(query);
+ /* clean out any stopword placeholders from the tree */
res = clean_fakeval(GETQUERY(query), &len);
if (!res)
{
@@ -349,6 +350,10 @@ to_tsquery_byid(PG_FUNCTION_ARGS)
}
memcpy((void *) GETQUERY(query), (void *) res, len * sizeof(QueryItem));
+ /*
+ * Removing the stopword placeholders might've resulted in fewer
+ * QueryItems. If so, move the operands up accordingly.
+ */
if (len != query->size)
{
char *oldoperand = GETOPERAND(query);
@@ -357,7 +362,7 @@ to_tsquery_byid(PG_FUNCTION_ARGS)
Assert(len < query->size);
query->size = len;
- memcpy((void *) GETOPERAND(query), oldoperand, VARSIZE(query) - (oldoperand - (char *) query));
+ memmove((void *) GETOPERAND(query), oldoperand, VARSIZE(query) - (oldoperand - (char *) query));
SET_VARSIZE(query, COMPUTESIZE(len, lenoperand));
}
--
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