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Commitca11af2

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petergeogheganpull[bot]
authored andcommitted
Fix nbtree lookahead overflow bug.
Add bounds checking to nbtree's lookahead/skip-within-a-page mechanism.Otherwise it's possible for cases with lots of before-array-keys tuplesto overflow an int16 variable, causing the mechanism to generate an outof bounds page offset number.Oversight in commit5bf748b, which enhanced nbtree ScalarArrayOpexecution.Reported-By: Alexander Lakhin <exclusion@gmail.com>Discussion:https://postgr.es/m/6c68ac42-bbb5-8b24-103e-af0e279c536f@gmail.comBackpatch: 17-, where nbtree SAOP execution was enhanced.
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‎src/backend/access/nbtree/nbtutils.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4091,7 +4091,7 @@ _bt_checkkeys_look_ahead(IndexScanDesc scan, BTReadPageState *pstate,
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*/
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if (!pstate->targetdistance)
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pstate->targetdistance=LOOK_AHEAD_DEFAULT_DISTANCE;
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else
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elseif (pstate->targetdistance<MaxIndexTuplesPerPage /2)
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pstate->targetdistance *=2;
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/* Don't read past the end (or before the start) of the page, though */

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