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
Branch
------
REL_14_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/a192243c75be0f142f829b3e73548bc7cbd3b90d
Modified Files
--------------
src/backend/commands/statscmds.c | 2 ++
1 file changed, 2 insertions(+)