From: drh <drh@noemail.net>
Date: Tue, 16 Dec 2008 13:46:29 +0000 (+0000)
Subject: Make sure the memory returned from sqlite3ScratchMalloc() is 8-byte aligned.
X-Git-Tag: version-3.6.10~153
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=66e8008404d70107795683f0fa2b533e0e641f46;p=thirdparty%2Fsqlite.git

Make sure the memory returned from sqlite3ScratchMalloc() is 8-byte aligned.
Ticket #3542. (CVS 6031)

FossilOrigin-Name: 13b56b7ff97c3abc116dae934f6d1330bbb7762d
---

diff --git a/manifest b/manifest
index eaa716a6df..ff409d4149 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C New\shyperlinks\sadded\sto\sC\sinterface\sdocumentation.\s\sNo\schanges\sto\sworking\scode.\s(CVS\s6030)
-D 2008-12-15T22:51:39
+C Make\ssure\sthe\smemory\sreturned\sfrom\ssqlite3ScratchMalloc()\sis\s8-byte\saligned.\nTicket\s#3542.\s(CVS\s6031)
+D 2008-12-16T13:46:30
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in f7e4c81c347b04f7b0f1c1b081a168645d7b8af7
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -100,7 +100,7 @@ F src/attach.c 1c35f95da3c62d19de75b44cfefd12c81c1791b3
 F src/auth.c c8b2ab5c8bad4bd90ed7c294694f48269162c627
 F src/bitvec.c 4300d311b17fb3c1476623fd895a8feac02a0b08
 F src/btmutex.c 63c5cc4ad5715690767ffcb741e185d7bc35ec1a
-F src/btree.c e5bfe007a4c4f643cb69426e6af0a9e556352f5b
+F src/btree.c fb64a2afba6d417b78d6727c4de34a821495ed1e
 F src/btree.h 179c3ea813780df78a289a8f5130db18e6d4616e
 F src/btreeInt.h 7ef2c872371d7508657f8d7a4efe651c741d6ee6
 F src/build.c ae4359475f82acbd947db6d957e2ff39d66de26e
@@ -120,7 +120,7 @@ F src/journal.c cffd2cd214e58c0e99c3ff632b3bee6c7cbb260e
 F src/legacy.c 4f7410b29598d991628ca40b150aa089649f17d8
 F src/loadext.c 2f53996c693a347edc2d773e9217dde49d96ae64
 F src/main.c 64857582ae00cc638973cbc47997d25fdbf26cf6
-F src/malloc.c 1e5eeb5a3074a6935bbe7b04bc058f630bfffd7e
+F src/malloc.c a0bd0c111550935ea30510f2ccdf3a769e9f7a56
 F src/mem0.c f2f84062d1f35814d6535c9f9e33de3bfb3b132c
 F src/mem1.c 3bfb39e4f60b0179713a7c087b2d4f0dc205735f
 F src/mem2.c 4c53c0071d3c68b8f252fe85d1667bad59421396
@@ -153,7 +153,7 @@ F src/resolve.c 18dc9f0df1d60048e012ce6632251063e0dd356a
 F src/rowset.c 2256fa4a928f750e2f3d6fc733523034beceb1d6
 F src/select.c a4316c5e8a417687e159b3d3ae689363d1dec5df
 F src/shell.c 60638e2fdfe97f1eb9c18caf87d3744d8269d012
-F src/sqlite.h.in 8fef8cb666774774dc66e5efaa9ddbdd582b3e74
+F src/sqlite.h.in 065a828e299960316aa34f05b9f0f10f33afe4c8
 F src/sqlite3ext.h 1db7d63ab5de4b3e6b83dd03d1a4e64fef6d2a17
 F src/sqliteInt.h a1478d1ec40bca0b511c06e2b4c93dc932aa3426
 F src/sqliteLimit.h f435e728c6b620ef7312814d660a81f9356eb5c8
@@ -675,7 +675,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P 4685ffccd37456fc527a7f7178885a060b474ad8
-R 45ffafc1c27ac1572b3348de46113af0
+P 230cb68e07ec791fa4a46dee8506716d52a99426
+R ef984ad615c40ec03c45bf9ef50a768d
 U drh
-Z 72935c89be1023bb560f7a983af461c1
+Z a906cffd56914bdaf5c9ddf8c186ccae
diff --git a/manifest.uuid b/manifest.uuid
index 215f90718a..f04812ca8f 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-230cb68e07ec791fa4a46dee8506716d52a99426
\ No newline at end of file
+13b56b7ff97c3abc116dae934f6d1330bbb7762d
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index a55caceeca..2cf890e61c 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.547 2008/12/10 21:19:57 drh Exp $
+** $Id: btree.c,v 1.548 2008/12/16 13:46:30 drh Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
@@ -5124,13 +5124,13 @@ static int balance_nonroot(BtCursor *pCur){
   }
   szCell = (u16*)&apCell[nMaxCells];
   aCopy[0] = (u8*)&szCell[nMaxCells];
-  assert( ((aCopy[0] - (u8*)apCell) & 7)==0 ); /* 8-byte alignment required */
+  assert( ((aCopy[0] - (u8*)0) & 7)==0 ); /* 8-byte alignment required */
   for(i=1; i<NB; i++){
     aCopy[i] = &aCopy[i-1][pBt->pageSize+ROUND8(sizeof(MemPage))];
-    assert( ((aCopy[i] - (u8*)apCell) & 7)==0 ); /* 8-byte alignment required */
+    assert( ((aCopy[i] - (u8*)0) & 7)==0 ); /* 8-byte alignment required */
   }
   aSpace1 = &aCopy[NB-1][pBt->pageSize+ROUND8(sizeof(MemPage))];
-  assert( ((aSpace1 - (u8*)apCell) & 7)==0 ); /* 8-byte alignment required */
+  assert( ((aSpace1 - (u8*)0) & 7)==0 ); /* 8-byte alignment required */
   if( ISAUTOVACUUM ){
     aFrom = &aSpace1[pBt->pageSize];
   }
diff --git a/src/malloc.c b/src/malloc.c
index ba0122df64..79e2054b5a 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -12,7 +12,7 @@
 **
 ** Memory allocation functions used throughout sqlite.
 **
-** $Id: malloc.c,v 1.51 2008/12/10 21:19:57 drh Exp $
+** $Id: malloc.c,v 1.52 2008/12/16 13:46:30 drh Exp $
 */
 #include "sqliteInt.h"
 #include <stdarg.h>
@@ -122,7 +122,7 @@ int sqlite3MallocInit(void){
   if( sqlite3GlobalConfig.pScratch && sqlite3GlobalConfig.szScratch>=100
       && sqlite3GlobalConfig.nScratch>=0 ){
     int i;
-    sqlite3GlobalConfig.szScratch -= 4;
+    sqlite3GlobalConfig.szScratch = (sqlite3GlobalConfig.szScratch - 4) & ~7;
     mem0.aScratchFree = (u32*)&((char*)sqlite3GlobalConfig.pScratch)
                   [sqlite3GlobalConfig.szScratch*sqlite3GlobalConfig.nScratch];
     for(i=0; i<sqlite3GlobalConfig.nScratch; i++){ mem0.aScratchFree[i] = i; }
@@ -135,7 +135,7 @@ int sqlite3MallocInit(void){
       && sqlite3GlobalConfig.nPage>=1 ){
     int i;
     int overhead;
-    int sz = sqlite3GlobalConfig.szPage;
+    int sz = sqlite3GlobalConfig.szPage & ~7;
     int n = sqlite3GlobalConfig.nPage;
     overhead = (4*n + sz - 1)/sz;
     sqlite3GlobalConfig.nPage -= overhead;
@@ -335,6 +335,7 @@ void *sqlite3ScratchMalloc(int n){
       sqlite3StatusSet(SQLITE_STATUS_SCRATCH_SIZE, n);
       sqlite3_mutex_leave(mem0.mutex);
       p = (void*)&((char*)sqlite3GlobalConfig.pScratch)[i];
+      assert(  ((p - (void*)0) & 7)==0 );
     }
   }
 #if SQLITE_THREADSAFE==0 && !defined(NDEBUG)
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index c54cdde10d..9970d7b1b5 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -30,7 +30,7 @@
 ** the version number) and changes its name to "sqlite3.h" as
 ** part of the build process.
 **
-** @(#) $Id: sqlite.h.in,v 1.419 2008/12/15 22:51:39 drh Exp $
+** @(#) $Id: sqlite.h.in,v 1.420 2008/12/16 13:46:30 drh Exp $
 */
 #ifndef _SQLITE3_H_
 #define _SQLITE3_H_
@@ -1050,7 +1050,7 @@ int sqlite3_os_end(void);
 **          S is a pointer to an aligned memory buffer not less than
 **          Z*N bytes in size shall cause S to be used by the
 **          [scratch memory allocator] for as many as N simulataneous
-**          allocations each of size Z.
+**          allocations each of size (Z & ~7).
 **
 ** {H14153} A successful call to [sqlite3_config]([SQLITE_CONFIG_SCRATCH],S,Z,N)
 **          where S is a NULL pointer shall disable the
@@ -1062,7 +1062,7 @@ int sqlite3_os_end(void);
 **          S is a pointer to an aligned memory buffer not less than
 **          Z*N bytes in size shall cause S to be used by the
 **          [pagecache memory allocator] for as many as N simulataneous
-**          allocations each of size Z.
+**          allocations each of size (Z & ~7).
 **
 ** {H14159} A successful call to
 **          [sqlite3_config]([SQLITE_CONFIG_PAGECACHE],S,Z,N)