From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 19 Dec 2010 17:48:34 +0000 (-0500)
Subject: Fix erroneous parsing of tsquery input "... & !(subexpression) | ..."
X-Git-Tag: REL9_1_ALPHA3~38
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=abc10262696e53773c9a8c9f279bbd464b464190;p=postgresql

Fix erroneous parsing of tsquery input "... & !(subexpression) | ..."

After parsing a parenthesized subexpression, we must pop all pending
ANDs and NOTs off the stack, just like the case for a simple operand.
Per bug #5793.

Also fix clones of this routine in contrib/intarray and contrib/ltree,
where input of types query_int and ltxtquery had the same problem.

Back-patch to all supported versions.
---

diff --git a/contrib/intarray/_int_bool.c b/contrib/intarray/_int_bool.c
index 7557c6acb7..4cc447bab2 100644
--- a/contrib/intarray/_int_bool.c
+++ b/contrib/intarray/_int_bool.c
@@ -196,8 +196,8 @@ makepol(WORKSTATE *state)
 			case OPEN:
 				if (makepol(state) == ERR)
 					return ERR;
-				if (lenstack && (stack[lenstack - 1] == (int4) '&' ||
-								 stack[lenstack - 1] == (int4) '!'))
+				while (lenstack && (stack[lenstack - 1] == (int4) '&' ||
+									stack[lenstack - 1] == (int4) '!'))
 				{
 					lenstack--;
 					pushquery(state, OPR, stack[lenstack]);
diff --git a/contrib/ltree/ltxtquery_io.c b/contrib/ltree/ltxtquery_io.c
index e1240c3d2f..826f4e1c9d 100644
--- a/contrib/ltree/ltxtquery_io.c
+++ b/contrib/ltree/ltxtquery_io.c
@@ -241,8 +241,8 @@ makepol(QPRS_STATE *state)
 			case OPEN:
 				if (makepol(state) == ERR)
 					return ERR;
-				if (lenstack && (stack[lenstack - 1] == (int4) '&' ||
-								 stack[lenstack - 1] == (int4) '!'))
+				while (lenstack && (stack[lenstack - 1] == (int4) '&' ||
+									stack[lenstack - 1] == (int4) '!'))
 				{
 					lenstack--;
 					pushquery(state, OPR, stack[lenstack], 0, 0, 0);
diff --git a/src/backend/utils/adt/tsquery.c b/src/backend/utils/adt/tsquery.c
index db9236a474..a155c933e2 100644
--- a/src/backend/utils/adt/tsquery.c
+++ b/src/backend/utils/adt/tsquery.c
@@ -371,8 +371,8 @@ makepol(TSQueryParserState state,
 			case PT_OPEN:
 				makepol(state, pushval, opaque);
 
-				if (lenstack && (opstack[lenstack - 1] == OP_AND ||
-								 opstack[lenstack - 1] == OP_NOT))
+				while (lenstack && (opstack[lenstack - 1] == OP_AND ||
+									opstack[lenstack - 1] == OP_NOT))
 				{
 					lenstack--;
 					pushOperator(state, opstack[lenstack]);