Avoid a segfault when OOM on a simple EXPLAIN query. Ticket #3478. (CVS 5860)

FossilOrigin-Name: acf26cc0f77b3a308d86f6dc02ecda66a4b12fd0

4 files changed, 16 insertions, 11 deletions

diff --git a/manifest b/manifest
index 10f209eb4..da630727a 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Add\sthe\ssqlite3_db_mutex()\sinterface.\s\sNo\stest\scases\syet.\s(CVS\s5859)
-D 2008-11-04T13:46:28
+C Avoid\sa\ssegfault\swhen\sOOM\son\sa\ssimple\sEXPLAIN\squery.\s\sTicket\s#3478.\s(CVS\s5860)
+D 2008-11-04T14:25:06
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in da817da72422f9b876602c225fcd17d6ca4182f7
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -194,7 +194,7 @@ F src/vdbe.c d2c9b71d0a996d87508ec841583ae50d23c9a3db
 F src/vdbe.h 03516f28bf5aca00a53c4dccd6c313f96adb94f6
 F src/vdbeInt.h 1fd87002786828b75046dcfbc942cf97036b8433
 F src/vdbeapi.c 6798c70cf176d23594ec557db88190ca8c7fa860
-F src/vdbeaux.c 68ec5b5d6aaf48d24121a2ed6c23124dd001c735
+F src/vdbeaux.c 3c6ebfba16fdc58d868bfc5a2f95fae9417130a6
 F src/vdbeblob.c b0dcebfafedcf9c0addc7901ad98f6f986c08935
 F src/vdbefifo.c 20fda2a7c4c0bcee1b90eb7e545fefcdbf2e1de7
 F src/vdbemem.c c0e9d9947db8968762c7621369f821bb181c1c86
@@ -428,7 +428,7 @@ F test/mallocF.test 2d5c590ebc2fc7f0dcebdf5aa8498b9aed69107e
 F test/mallocG.test 4584d0d8ddb8009f16ca0c8bab1fa37f6358efa2
 F test/mallocH.test 79b65aed612c9b3ed2dcdaa727c85895fd1bfbdb
 F test/mallocI.test 6e24fe6444bd2999ccc81f984977b44c0d6e5591
-F test/mallocJ.test 5e7798d543cd837d6fd1c1d8086fe1867e705723
+F test/mallocJ.test 110204e20eb8a9475d6df57d07d09c31d4542b07
 F test/malloc_common.tcl 984baeb6c6b185e798827d1187d426acc2bc4962
 F test/manydb.test 8de36b8d33aab5ef295b11d9e95310aeded31af8
 F test/memdb.test a67bda4ff90a38f2b19f6c7f95aa7289e051d893
@@ -654,7 +654,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P cedfa214e4e979ab04a30f558f767d46862151de
-R 455fe7ce922ef8b355f1e416fa2f04b2
+P d95de32e8ded397adeef8f7a29b87bc85669ac95
+R 311b672b2aa5220681c6b634ffa28a60
 U drh
-Z e3ee957bbe72b22fd564e398dd239acd
+Z 3b3f6a00601535b79e178ee5461e8314
diff --git a/manifest.uuid b/manifest.uuid
index fe8000866..791bdb591 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-d95de32e8ded397adeef8f7a29b87bc85669ac95
\ No newline at end of file
+acf26cc0f77b3a308d86f6dc02ecda66a4b12fd0
\ No newline at end of file
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index 04d400614..adb3e4b03 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -14,7 +14,7 @@
 ** to version 2.8.7, all this code was combined into the vdbe.c source file.
 ** But that file was getting too big so this subroutines were split out.
 **
-** $Id: vdbeaux.c,v 1.415 2008/11/03 20:55:07 drh Exp $
+** $Id: vdbeaux.c,v 1.416 2008/11/04 14:25:06 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -1038,7 +1038,7 @@ void sqlite3VdbeMakeReady(
     /*resizeOpArray(p, p->nOp);*/
     assert( nVar>=0 );
     if( isExplain && nMem<10 ){
-      p->nMem = nMem = 10;
+      nMem = 10;
     }
     p->aMem = sqlite3DbMallocZero(db,
         nMem*sizeof(Mem)               /* aMem */
diff --git a/test/mallocJ.test b/test/mallocJ.test
index 015e2093c..58f5b2b33 100644
--- a/test/mallocJ.test
+++ b/test/mallocJ.test
@@ -12,7 +12,7 @@
 # This test script checks malloc failures in LIMIT operations for 
 # UPDATE/DELETE statements.
 # 
-# $Id: mallocJ.test,v 1.2 2008/10/30 22:13:23 drh Exp $
+# $Id: mallocJ.test,v 1.3 2008/11/04 14:25:06 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -49,4 +49,9 @@ do_malloc_test mallocJ-2 -sqlprep {
     ORDER BY 2, 3;
 }
 
+# ticket #3478
+do_malloc_test mallocJ-3 -sqlbody {
+  EXPLAIN COMMIT
+}
+
 finish_test