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Avoid an undefined integer overflow in fts3 by detecting data structure corruption earlier.

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FossilOrigin-Name: 86e98ddc19470410ccc6d2cf4ad56ef0bc5a23b7fbe6331b8cae374689f54529
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dan
2020-03-20 20:18:49 +00:00
parent 589c787620
commit ec8e689a20
4 changed files with 27 additions and 9 deletions
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6
ext/fts3/fts3_write.c
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@ -4953,6 +4953,12 @@ int sqlite3Fts3Incrmerge(Fts3Table *p, int nMerge, int nMin){
** Exit early in this case. */
if( nSeg<=0 ) break;
assert( nMod<=0x7FFFFFFF );
if( iAbsLevel<0 || iAbsLevel>(nMod<<32) ){
rc = FTS_CORRUPT_VTAB;
break;
}
/* Open a cursor to iterate through the contents of the oldest nSeg
** indexes of absolute level iAbsLevel. If this cursor is opened using
** the 'hint' parameters, it is possible that there are less than nSeg