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Improved detection of corruption in the %_stat table of FTS4.

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Chromium ticket 1025467.

FossilOrigin-Name: 10f8a3b718e0f47be528fba086c318e1dfe18ead383d01cfa24dedabad41e0a2
This commit is contained in:
drh
2019-11-18 10:37:57 +00:00
parent ac801803a5
commit 19d4175d65
4 changed files with 20 additions and 11 deletions
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4
ext/fts3/fts3_snippet.c
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@ -1065,10 +1065,10 @@ static int fts3MatchinfoSelectDoctotal(
}
pEnd = a + n;
a += sqlite3Fts3GetVarintBounded(a, pEnd, &nDoc);
if( nDoc==0 || a>pEnd ){
if( nDoc<=0 || a>pEnd ){
return FTS_CORRUPT_VTAB;
}
*pnDoc = (u32)nDoc;
*pnDoc = nDoc;
if( paLen ) *paLen = a;
if( ppEnd ) *ppEnd = pEnd;