Fix segfaults that might occur after a malloc failure. (CVS 2119)

FossilOrigin-Name: 368774487e7a0266465f5a1c2701c9b14573d26c

manifest

@@ -1,5 +1,5 @@
-C Documentation\sfor\sREINDEX\sand\sALTER\sTABLE\scommands.\s(CVS\s2118)
-D 2004-11-20T08:17:18
+C Fix\ssegfaults\sthat\smight\soccur\safter\sa\smalloc\sfailure.\s(CVS\s2119)
+D 2004-11-20T18:13:10
 F Makefile.in e747bb5ba34ccbdd81f79dcf1b2b33c02817c21d
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README a01693e454a00cc117967e3f9fdab2d4d52e9bc1
@@ -31,10 +31,10 @@ F src/attach.c e49d09dad9f5f9fb10b4b0c1be5a70ae4c45e689
 F src/auth.c 3b81f2a42f48a62c2c9c9b0eda31a157c681edea
 F src/btree.c 49b09718cd988d1c7c981b03e94679bc10b5f711
 F src/btree.h 861e40b759a195ba63819740e484390012cf81ab
-F src/build.c a43f3b8f452dbd28ad94fad788693f3fc2336908
+F src/build.c c7dd57fdbb330d65df241277291cad8e58687a46
 F src/date.c 65536e7ea04fdde6e0551264fca15966966e171f
 F src/delete.c be9d039b819f4a5d0fdfaeceace139ba189ef819
-F src/expr.c 4ee3e47358c92a919062255b14057a7a8f641e01
+F src/expr.c 90f440e1fe065717bbe391cc4de455997794399d
 F src/func.c b668e5ad043176049454c95a6a780367a0e8f6bb
 F src/hash.c a97721a55440b7bea31ffe471bb2f6b4123cddd5
 F src/hash.h 1b0c445e1c89ff2aaad9b4605ba61375af001e84
@@ -260,7 +260,7 @@ F www/tclsqlite.tcl 560ecd6a916b320e59f2917317398f3d59b7cc25
 F www/vdbe.tcl 095f106d93875c94b47367384ebc870517431618
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl fdacb0ba2d39831e8a6240d05a490026ad4c4e4c
-P 5efa2d2a602c3b7249c4e6701e97b16b5ad0280d
-R 502686892546d476cbd8522ca98f27e6
-U danielk1977
-Z 626ea436eea0d0f50a92b6b634fdfd52
+P aceaa5f6e97c93962f5d6d14de8a490efa619db4
+R 8f9d5443bb2a95ac89805536ee413fef
+U drh
+Z 96591b175a33effa711ce86d94861df3

manifest.uuid

@@ -1 +1 @@
-aceaa5f6e97c93962f5d6d14de8a490efa619db4
+368774487e7a0266465f5a1c2701c9b14573d26c

src/build.c

@@ -22,7 +22,7 @@
 **     COMMIT
 **     ROLLBACK
 **
-** $Id: build.c,v 1.284 2004/11/19 08:41:34 danielk1977 Exp $
+** $Id: build.c,v 1.285 2004/11/20 18:13:10 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -136,6 +136,9 @@ void sqlite3NestedParse(Parse *pParse, const char *zFormat, ...){
   va_start(ap, zFormat);
   zSql = sqlite3VMPrintf(zFormat, ap);
   va_end(ap);
+  if( zSql==0 ){
+    return;   /* A malloc must have failed */
+  }
   pParse->nested++;
   memcpy(saveBuf, &pParse->nVar, SAVE_SZ);
   memset(&pParse->nVar, 0, SAVE_SZ);
@@ -516,10 +519,14 @@ void sqlite3OpenMasterTable(Vdbe *v, int iDb){
 ** does not exist.
 */
 int findDb(sqlite3 *db, Token *pName){
-  int i;
-  Db *pDb;
-  char *zName = sqlite3NameFromToken(pName);
-  int n = strlen(zName);
+  int i;         /* Database number */
+  int n;         /* Number of characters in the name */
+  Db *pDb;       /* A database whose name space is being searched */
+  char *zName;   /* Name we are searching for */
+
+  zName = sqlite3NameFromToken(pName);
+  if( zName ){
+    n = strlen(zName);
     for(pDb=db->aDb, i=0; i<db->nDb; i++, pDb++){
       if( n==strlen(pDb->zName) && 0==sqlite3StrICmp(pDb->zName, zName) ){
         sqliteFree(zName);
@@ -527,6 +534,7 @@ int findDb(sqlite3 *db, Token *pName){
       }
     }
     sqliteFree(zName);
+  }
   return -1;
 }
 

src/expr.c

@@ -12,7 +12,7 @@
 ** This file contains routines used for analyzing expressions and
 ** for generating VDBE code that evaluates expressions in SQLite.
 **
-** $Id: expr.c,v 1.170 2004/11/12 03:56:15 drh Exp $
+** $Id: expr.c,v 1.171 2004/11/20 18:13:10 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -220,6 +220,9 @@ Expr *sqlite3RegisterExpr(Parse *pParse, Token *pToken){
     return 0;
   }
   p = sqlite3Expr(TK_REGISTER, 0, 0, pToken);
+  if( p==0 ){
+    return 0;  /* Malloc failed */
+  }
   depth = atoi(&pToken->z[1]);
   if( depth>=0 ){
     p->iTable = pParse->nMem++;