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Commita7ca25c

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Avoid fetching past the end of the indoption array.
pg_get_indexdef_worker carelessly fetched indoption entries even fornon-key index columns that don't have one. 99.999% of the time thiswould be harmless, since the code wouldn't examine the value ... butsome fine day this will be a fetch off the end of memory, resultingin SIGSEGV.Detected through valgrind testing. Odd that the buildfarm's valgrindcritters haven't noticed.
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‎src/backend/utils/adt/ruleutils.c‎

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1305,7 +1305,6 @@ pg_get_indexdef_worker(Oid indexrelid, int colno,
13051305
for (keyno=0;keyno<idxrec->indnatts;keyno++)
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{
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AttrNumberattnum=idxrec->indkey.values[keyno];
1308-
int16opt=indoption->values[keyno];
13091308
Oidkeycoltype;
13101309
Oidkeycolcollation;
13111310

@@ -1367,10 +1366,10 @@ pg_get_indexdef_worker(Oid indexrelid, int colno,
13671366
if (!attrsOnly&&keyno<idxrec->indnkeyatts&&
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(!colno||colno==keyno+1))
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{
1370-
Oidindcoll;
1369+
int16opt=indoption->values[keyno];
1370+
Oidindcoll=indcollation->values[keyno];
13711371

13721372
/* Add collation, if not default for column */
1373-
indcoll=indcollation->values[keyno];
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if (OidIsValid(indcoll)&&indcoll!=keycolcollation)
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appendStringInfo(&buf," COLLATE %s",
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generate_collation_name((indcoll)));

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