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Fix division by zero in _bt_vacuum_needs_cleanup() 

Checks inside _bt_vacuum_needs_cleanup() allow division by zero to happen when
metad->btm_last_cleanup_num_heap_tuples == 0.  This commit adjusts the
expression so that no division by zero might happen.

Reported-by: Piotr Stefaniak
Discussion: https://postgr.es/m/DB8PR03MB5931C41F7787A95313F08322F22A0%40DB8PR03MB5931.eurprd03.prod.outlook.com
Reviewed-by: Masahiko Sawada
Backpatch-through: 11
This commit is contained in:
Alexander Korotkov 2019-04-15 20:20:43 +03:00
parent 3a45321a49
commit 1e87198182
1 changed files with 1 additions and 1 deletions
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2
src/backend/access/nbtree/nbtree.c
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@ -835,7 +835,7 @@ _bt_vacuum_needs_cleanup(IndexVacuumInfo *info)
prev_num_heap_tuples = metad->btm_last_cleanup_num_heap_tuples;
if (cleanup_scale_factor <= 0 ||
prev_num_heap_tuples < 0 ||
prev_num_heap_tuples <= 0 ||
(info->num_heap_tuples - prev_num_heap_tuples) /
prev_num_heap_tuples >= cleanup_scale_factor)
result = true;