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Allocate a few extra bytes for the pager temp page as an overrun buffer while

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processing corrupt database files.

FossilOrigin-Name: e7aca0714bc475e04b16e9db78722ce025d2a1382f80cfc0a49cff2af904eae5
This commit is contained in:
drh
2019-02-26 17:49:07 +00:00
parent eaac9996ed
commit 5cb1ffc1bd
3 changed files with 15 additions and 9 deletions
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10
src/pager.c
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@@ -3786,8 +3786,14 @@ int sqlite3PagerSetPagesize(Pager *pPager, u32 *pPageSize, int nReserve){
rc = sqlite3OsFileSize(pPager->fd, &nByte);
}
if( rc==SQLITE_OK ){
pNew = (char *)sqlite3PageMalloc(pageSize);
if( !pNew ) rc = SQLITE_NOMEM_BKPT;
/* 8 bytes of zeroed overrun space is sufficient so that the b-tree
* cell header parser will never run off the end of the allocation */
pNew = (char *)sqlite3PageMalloc(pageSize+8);
if( !pNew ){
rc = SQLITE_NOMEM_BKPT;
}else{
memset(pNew+pageSize, 0, 8);
}
}
if( rc==SQLITE_OK ){