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Avoid referencing off the end of subplan_partition_offsets.

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Report by buildfarm member skink and Tom Lane.  Analysis by me.
Patch by Amit Khandekar.

Discussion: http://postgr.es/m/CAJ3gD9fVA1iXQYhfqHP5n_TEd4U9=V8TL_cc-oKRnRmxgdvJrQ@mail.gmail.com
This commit is contained in:
Robert Haas
2018-01-24 16:34:51 -05:00
parent d6ab720360
commit 945f71db84
3 changed files with 6 additions and 1 deletions
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2
src/backend/executor/execPartition.c
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@ -87,6 +87,7 @@ ExecSetupPartitionTupleRouting(ModifyTableState *mtstate,
num_update_rri = list_length(node->plans);
proute->subplan_partition_offsets =
palloc(num_update_rri * sizeof(int));
proute->num_subplan_partition_offsets = num_update_rri;
/*
* We need an additional tuple slot for storing transient tuples that
@ -481,6 +482,7 @@ ExecCleanupTupleRouting(PartitionTupleRouting *proute)
* result rels are present in the UPDATE subplans.
*/
if (proute->subplan_partition_offsets &&
subplan_index < proute->num_subplan_partition_offsets &&
proute->subplan_partition_offsets[subplan_index] == i)
{
subplan_index++;