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When inserting a 3-byte cell into a btree, ensure that the extra padding byte

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is 0x00.  This is not necessary for security, as far as I can tell, but it
seems like a reasonable precaution.

FossilOrigin-Name: 5766f1279dab91e030d4dcf5133659e5cedf914a1628ccf00d67d8e50a9957fd
This commit is contained in:
drh
2024-02-26 15:27:33 +00:00
parent 09e1900cdc
commit 7c6433cfff
3 changed files with 16 additions and 11 deletions
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10
src/btree.c
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@@ -7007,7 +7007,10 @@ static int fillInCell(
n = nHeader + nPayload;
testcase( n==3 );
testcase( n==4 );
if( n<4 ) n = 4;
if( n<4 ){
n = 4;
pPayload[nPayload] = 0;
}
*pnSize = n;
assert( nSrc<=nPayload );
testcase( nSrc<nPayload );
@@ -9453,7 +9456,10 @@ int sqlite3BtreeInsert(
if( flags & BTREE_PREFORMAT ){
rc = SQLITE_OK;
szNew = p->pBt->nPreformatSize;
if( szNew<4 ) szNew = 4;
if( szNew<4 ){
szNew = 4;
newCell[3] = 0;
}
if( ISAUTOVACUUM(p->pBt) && szNew>pPage->maxLocal ){
CellInfo info;
pPage->xParseCell(pPage, newCell, &info);