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Improved selection of the divisor when subdividing nested Bitvec objects.

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This fixes a potential stack overflow that can occur when the database size
is within 60 pages of the maximum allowed by the file format.

FossilOrigin-Name: f7ab764ed9df6d7a4a96cb0933d291f00174f33fed3d9951785078fe225adcb7
This commit is contained in:
drh
2025-06-10 19:52:21 +00:00
parent 6a23ff5a07
commit a09a4fbac9
3 changed files with 10 additions and 8 deletions
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4
src/bitvec.c
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@@ -217,7 +217,9 @@ bitvec_set_rehash:
}else{
memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
memset(p->u.apSub, 0, sizeof(p->u.apSub));
p->iDivisor = (p->iSize + BITVEC_NPTR - 1)/BITVEC_NPTR;
p->iDivisor = p->iSize/BITVEC_NPTR;
if( (p->iSize%BITVEC_NPTR)!=0 ) p->iDivisor++;
if( p->iDivisor<BITVEC_NBIT ) p->iDivisor = BITVEC_NBIT;
rc = sqlite3BitvecSet(p, i);
for(j=0; j<BITVEC_NINT; j++){
if( aiValues[j] ) rc |= sqlite3BitvecSet(p, aiValues[j]);