From 8465efc1a0e721a070221c4aa83695422922b620 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Mon, 25 Sep 2023 11:50:28 -0400 Subject: [PATCH] Limit to_tsvector_byid's initial array allocation to something sane. The initial estimate of the number of distinct ParsedWords is just that: an estimate. Don't let it exceed what palloc is willing to allocate. If in fact we need more entries, we'll eventually fail trying to enlarge the array. But if we don't, this allows success on inputs that currently draw "invalid memory alloc request size". Per bug #18080 from Uwe Binder. Back-patch to all supported branches. Discussion: https://postgr.es/m/18080-d5c5e58fef8c99b7@postgresql.org --- src/backend/tsearch/to_tsany.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/backend/tsearch/to_tsany.c b/src/backend/tsearch/to_tsany.c index 3b6d41f9e8e..fe39d6c4b93 100644 --- a/src/backend/tsearch/to_tsany.c +++ b/src/backend/tsearch/to_tsany.c @@ -252,6 +252,8 @@ to_tsvector_byid(PG_FUNCTION_ARGS) * number */ if (prs.lenwords < 2) prs.lenwords = 2; + else if (prs.lenwords > MaxAllocSize / sizeof(ParsedWord)) + prs.lenwords = MaxAllocSize / sizeof(ParsedWord); prs.curwords = 0; prs.pos = 0; prs.words = (ParsedWord *) palloc(sizeof(ParsedWord) * prs.lenwords);