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Follow-on to the previous check-in to prevent a division by zero if the

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lookahead slot size is something goofy like 6 on a 32-bit machine.

FossilOrigin-Name: 6bda711f93e753dd0be8d896a007b3f7b5064787
This commit is contained in:
drh
2011-11-10 02:39:28 +00:00
parent 8225d66be6
commit 61a4bd5c6c
3 changed files with 10 additions and 11 deletions
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7
src/main.c
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@@ -482,22 +482,21 @@ static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
if( db->lookaside.bMalloced ){
sqlite3_free(db->lookaside.pStart);
}
/* The size of a lookaside slot needs to be larger than a pointer
** to be useful.
/* The size of a lookaside slot after ROUNDDOWN8 needs to be larger
** than a pointer to be useful.
*/
sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */
if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0;
if( cnt<0 ) cnt = 0;
if( sz==0 || cnt==0 ){
sz = 0;
pStart = 0;
}else if( pBuf==0 ){
sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */
sqlite3BeginBenignMalloc();
pStart = sqlite3Malloc( sz*cnt ); /* IMP: R-61949-35727 */
sqlite3EndBenignMalloc();
if( pStart ) cnt = sqlite3MallocSize(pStart)/sz;
}else{
sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */
pStart = pBuf;
}
db->lookaside.pStart = pStart;