Fix a case where deleting a row from a corrupt database could cause an assert to fail. (CVS 6881)

FossilOrigin-Name: 6994b41a94a60f6460cf9814767db321ab3851f7

manifest

@@ -1,5 +1,5 @@
-C Bug\sfix\sin\sthe\scomputation\sof\sthe\snumber\sof\spages\sto\sautovacuum\swhen\nnReserve\sis\sgreater\sthan\szero.\s(CVS\s6880)
-D 2009-07-11T17:04:09
+C Fix\sa\scase\swhere\sdeleting\sa\srow\sfrom\sa\scorrupt\sdatabase\scould\scause\san\sassert\sto\sfail.\s(CVS\s6881)
+D 2009-07-11T17:39:42
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in df9359da7a726ccb67a45db905c5447d5c00c6ef
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -106,7 +106,7 @@ F src/auth.c 802a9439dfa0b8c208b10055cba400e82ef18025
 F src/backup.c 6f1c2d9862c8a3feb7739dfcca02c1f5352e37f3
 F src/bitvec.c 0ef0651714728055d43de7a4cdd95e703fac0119
 F src/btmutex.c 9b899c0d8df3bd68f527b0afe03088321b696d3c
-F src/btree.c 6a5d08b45a7850fde2deec76254ca6a3c1ad7ffc
+F src/btree.c 2604d94126c050559cd65eef2c8f257d9ca67358
 F src/btree.h e53a10fd31d16c60a86f03c9467a6f470aa3683b
 F src/btreeInt.h a568bf057aa249eb06fd31358b4393a5ac88c118
 F src/build.c 867028ee9f63f7bc8eb8d4a720bb98cf9b9a12b4
@@ -280,7 +280,7 @@ F test/collateA.test b8218ab90d1fa5c59dcf156efabb1b2599c580d6
 F test/colmeta.test 087c42997754b8c648819832241daf724f813322
 F test/colname.test 08948a4809d22817e0e5de89c7c0a8bd90cb551b
 F test/conflict.test 0ed68b11f22721052d880ee80bd528a0e0828236
-F test/corrupt.test 5bcf7a986358123b8055dfa64b45fc2fb54dcaa9
+F test/corrupt.test e940096bcfac0399d09c5351c0d6ea610477c08a
 F test/corrupt2.test a571e30ea4e82318f319a24b6cc55935ce862079
 F test/corrupt3.test 263e8bb04e2728df832fddf6973cf54c91db0c32
 F test/corrupt4.test acdb01afaedf529004b70e55de1a6f5a05ae7fff
@@ -740,7 +740,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl 672f81d693a03f80f5ae60bfefacd8a349e76746
-P d99bde9ca61eeccfe6363ff0882fd4bcdb9a34dc
-R f20bebc61397821a68a2cae56e0278b2
-U drh
-Z 1fcddebe9a4cc8ca7d7de11a8e8fa230
+P 618a83d65f973183d21245721dc656a35ff594a4
+R eb96100d6844858ed92c59e456fef299
+U danielk1977
+Z da4642526cf31e5a9d82946419b45e5e

manifest.uuid

@@ -1 +1 @@
-618a83d65f973183d21245721dc656a35ff594a4
+6994b41a94a60f6460cf9814767db321ab3851f7

src/btree.c

@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.679 2009/07/11 17:04:09 drh Exp $
+** $Id: btree.c,v 1.680 2009/07/11 17:39:42 danielk1977 Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
@@ -3927,7 +3927,7 @@ static int moveToChild(BtCursor *pCur, u32 newPgno){
 
   pCur->info.nSize = 0;
   pCur->validNKey = 0;
-  if( pNewPage->nCell<1 ){
+  if( pNewPage->nCell<1 || pNewPage->intKey!=pCur->apPage[i]->intKey ){
     return SQLITE_CORRUPT_BKPT;
   }
   return SQLITE_OK;

test/corrupt.test

@@ -13,7 +13,7 @@
 # This file implements tests to make sure SQLite does not crash or
 # segfault if it sees a corrupt database file.
 #
-# $Id: corrupt.test,v 1.10 2008/08/25 12:14:09 drh Exp $
+# $Id: corrupt.test,v 1.11 2009/07/11 17:39:42 danielk1977 Exp $
 
 catch {file delete -force test.db test.db-journal test.bu}
 
@@ -174,4 +174,36 @@ do_test corrupt-3.6 {
   }
 } {1 {database disk image is malformed}}
 
+do_test corrupt-4.1 {
+  db close
+  file delete -force test.db test.db-journal
+  sqlite3 db test.db
+  execsql {
+    PRAGMA page_size = 1024;
+    CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT);
+  }
+  for {set i 0} {$i < 10} {incr i} {
+    set text [string repeat $i 220]
+    execsql { INSERT INTO t1 VALUES($i, $text) }
+  }
+  execsql { CREATE INDEX i1 ON t1(b) }
+} {}
+do_test corrupt-4.2 {
+  set iRoot [db one {SELECT rootpage FROM sqlite_master WHERE name = 'i1'}]
+  set iOffset [hexio_get_int [hexio_read test.db [expr 12+($iRoot-1)*1024] 2]]
+  set data [hexio_render_int32 [expr $iRoot - 1]]
+  hexio_write test.db [expr ($iRoot-1)*1024 + $iOffset] $data
+  db close
+  sqlite3 db test.db
+
+  # The following DELETE statement attempts to delete a cell stored on the
+  # root page of index i1. After this cell is deleted it must be replaced
+  # by a cell retrieved from the child page (a leaf) of the deleted cell.
+  # This will fail, as the block modified the database image so that the
+  # child page of the deleted cell is from a table (intkey) b-tree, not an
+  # index b-tree as expected. At one point this was causing an assert()
+  # to fail.
+  catchsql { DELETE FROM t1 WHERE rowid = 3 }
+} {1 {database disk image is malformed}}
+
 finish_test