Fix a crash that could occur under certain circumstances if the vectors on either side of a comparison operator were of a different size.

FossilOrigin-Name: 42670935aba152ba774c2a8bdcbe72b943309d68

manifest

@@ -1,5 +1,5 @@
-C Fix\sa\sproblem\scausing\sthe\saffinity\sof\ssub-select\srow-value\selements\sto\sbe\signored\sin\ssome\scontextes.
-D 2016-09-03T19:52:12.432
+C Fix\sa\scrash\sthat\scould\soccur\sunder\scertain\scircumstances\sif\sthe\svectors\son\seither\sside\sof\sa\scomparison\soperator\swere\sof\sa\sdifferent\ssize.
+D 2016-09-05T09:44:45.878
 F Makefile.in cfd8fb987cd7a6af046daa87daa146d5aad0e088
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 5017381e4853b1472e01d5bb926be1268eba429c
@@ -338,7 +338,7 @@ F src/ctime.c e77f3dc297b4b65c96da78b4ae4272fdfae863d7
 F src/date.c 95c9a8d00767e7221a8e9a31f4e913fc8029bf6b
 F src/dbstat.c 19ee7a4e89979d4df8e44cfac7a8f905ec89b77d
 F src/delete.c 76c084f0265f4a3cd1ecf17eee112a94f1ccbc05
-F src/expr.c 23b595cc6e2b609d53c72343b3fe16ce8b5e446d
+F src/expr.c 750ed16649d655fef117c6d983c7382acd625bfd
 F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
 F src/fkey.c e2be0968c1adc679c87e467aa5b4f167588f38a8
 F src/func.c 29cc9acb170ec1387b9f63eb52cd85f8de96c771
@@ -390,7 +390,7 @@ F src/shell.c 79dda477be6c96eba6e952a934957ad36f87acc7
 F src/sqlite.h.in 4a030e254e204570444b34bf7d40fb4a5416089e
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 8648034aa702469afb553231677306cc6492a1ae
-F src/sqliteInt.h c9e010a79ab4ed7bdc910a24d8f08f3c6d5f822c
+F src/sqliteInt.h e7afbfaa4033a4c1cf2aa7bbdd0eb27e4663ab3a
 F src/sqliteLimit.h c0373387c287c8d0932510b5547ecde31b5da247
 F src/status.c a9e66593dfb28a9e746cba7153f84d49c1ddc4b1
 F src/table.c 5226df15ab9179b9ed558d89575ea0ce37b03fc9
@@ -468,7 +468,7 @@ F src/walker.c 2d2cc7fb0f320f7f415215d7247f3c584141ac09
 F src/where.c 48d705e5196a0611a7be90698eade455ee238536
 F src/whereInt.h 14dd243e13b81cbb0a66063d38b70f93a7d6e613
 F src/wherecode.c 8a9a53cb52dd8a75e07c85e3bc12c1604c735954
-F src/whereexpr.c 7f9ada866d48d15d09754ae819c1c40efe3b2aff
+F src/whereexpr.c 571597ac8d761505f626e597884b2a03494053cd
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1023,7 +1023,7 @@ F test/rowid.test 5b7509f384f4f6fae1af3c8c104c8ca299fea18d
 F test/rowvalue.test 7d8482dde9023973615eaaca65647f33d70c1f01
 F test/rowvalue2.test 060d238b7e5639a7c5630cb5e63e311b44efef2b
 F test/rowvalue3.test 01399b7bf150b0d41abce76c18072da777c2500c
-F test/rowvalue4.test 9b40c9be9bdde30fc66cddbfdf6a5af37de4ccac
+F test/rowvalue4.test 29494f1c66e73329d90027619ee6d22e7ffe0ebf
 F test/rowvalue5.test a440d490c8c0bf606034c09d5c6bbf7840b98f95
 F test/rowvalue6.test d19b54feb604d5601f8614b15e214e0774c01087
 F test/rowvalue7.test 5d06ff19d9e6969e574a2e662a531dd0c67801a8
@@ -1522,7 +1522,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ed206048484667e4fe6aaeadd65882537d74bd35
-R ebdd3ea482059f46220cc36bb6b2e41e
+P 7d9bd22c0715ede2592ee1fa7ebc215aded1ca1b
+R 26e65ef1f9dc6647fee64756ced37096
 U dan
-Z 13aac770e03afb07d71bee955ff12a59
+Z c125d50595ea7cb48721a8bf5a5398c8

manifest.uuid

@@ -1 +1 @@
-7d9bd22c0715ede2592ee1fa7ebc215aded1ca1b
+42670935aba152ba774c2a8bdcbe72b943309d68

src/expr.c

@@ -521,14 +521,9 @@ static void codeVectorCompare(
   Vdbe *v = pParse->pVdbe;
   Expr *pLeft = pExpr->pLeft;
   Expr *pRight = pExpr->pRight;
-  int nLeft = sqlite3ExprVectorSize(pLeft);
-  int nRight = sqlite3ExprVectorSize(pRight);
 
-  /* Check that both sides of the comparison are vectors, and that
-  ** both are the same length.  */
-  if( nLeft!=nRight ){
-    sqlite3ErrorMsg(pParse, "row value misused");
-  }else{
+  if( sqlite3ExprCheckComparison(pParse, pLeft, pRight)==0 ){
+    int nLeft = sqlite3ExprVectorSize(pLeft);
     int i;
     int regLeft = 0;
     int regRight = 0;
@@ -2656,6 +2651,29 @@ int sqlite3ExprCheckIN(Parse *pParse, Expr *pIn){
 }
 #endif
 
+/*
+** Expressions pLeft and pRight are the left and right sides of a comparison
+** operator. If either pLeft or pRight is a vector and the other is not, or
+** if they are both vectors but of a different size, leave an error message
+** in the Parse object and return non-zero. Or, if there is no problem, 
+** return 0.
+*/
+int sqlite3ExprCheckComparison(Parse *pParse, Expr *pLeft, Expr *pRight){
+  int nLeft = sqlite3ExprVectorSize(pLeft);
+  int nRight = sqlite3ExprVectorSize(pRight);
+  if( nLeft!=nRight ){
+    if( (pRight->flags & EP_xIsSelect) ){
+      sqlite3SubselectError(pParse, nRight, nLeft);
+    }else if( pLeft->flags & EP_xIsSelect ){
+      sqlite3SubselectError(pParse, nLeft, nRight);
+    }else{
+      sqlite3ErrorMsg(pParse, "row value misused");
+    }
+    return 1;
+  }
+  return 0;
+}
+
 #ifndef SQLITE_OMIT_SUBQUERY
 /*
 ** Generate code for an IN expression.

src/sqliteInt.h

@@ -4009,6 +4009,7 @@ int sqlite3ExprCheckIN(Parse*, Expr*);
 #else
 # define sqlite3ExprCheckIN(x,y) SQLITE_OK
 #endif
+int sqlite3ExprCheckComparison(Parse*, Expr*, Expr*);
 
 #ifdef SQLITE_ENABLE_STAT3_OR_STAT4
 void sqlite3AnalyzeFunctions(void);

src/whereexpr.c

@@ -952,6 +952,10 @@ static void exprAnalyze(
     Expr *pRight = sqlite3ExprSkipCollate(pExpr->pRight);
     u16 opMask = (pTerm->prereqRight & prereqLeft)==0 ? WO_ALL : WO_EQUIV;
 
+    if( pRight && sqlite3ExprCheckComparison(pParse, pLeft, pRight) ){
+      return;
+    }
+
     if( pTerm->iField>0 ){
       assert( op==TK_IN );
       assert( pLeft->op==TK_VECTOR );

test/rowvalue4.test

@@ -47,6 +47,8 @@ foreach {tn s error} {
 
   6 "SELECT * FROM t1 WHERE (a, b) IN (SELECT * FROM t1)" 
                              {sub-select returns 3 columns - expected 2}
+  7 "SELECT * FROM t1 WHERE (c, c) <= 1" {row value misused}
+  8 "SELECT * FROM t1 WHERE (b, b) <= 1" {row value misused}
 } {
   do_catchsql_test 2.$tn "$s" [list 1 $error]
 }