Horton

Check syscache result in AlterStatistics

Tomas Vondra <tomas.vondra@postgresql.org>

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Commit: 6d554e3fcd6fb8be2dbcbd3521e2947ed7a552cb
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2022-01-23T02:16:31Z
Releases: 15.0 
Check syscache result in AlterStatistics

The syscache lookup may return NULL even for valid OID, for example due
to a concurrent DROP STATISTICS, so a HeapTupleIsValid is necessary.
Without it, it may fail with a segfault.

Reported by Alexander Lakhin, patch by me. Backpatch to 13, where ALTER
STATISTICS ... SET STATISTICS was introduced.

Backpatch-through: 13
Discussion: https://postgr.es/m/17372-bf3b6e947e35ae77%40postgresql.org

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PathChange+/−
src/backend/commands/statscmds.c modified +2 −0

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