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CheckNNConstraintFetch: Fill all of ConstrCheck in a single pass

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Previously, we'd fill all fields except ccbin, and only later obtain and
detoast ccbin, with hypothetical failures being possible.  If ccbin is
null (rare catalog corruption I have never witnessed) or its a corrupted
toast entry, we leak a tiny bit of memory in CacheMemoryContext from
having strdup'd the constraint name.  Repair these by only attempting to
fill the struct once ccbin has been detoasted.

Author: Ranier Vilela <ranier.vf@gmail.com>
Discussion: https://postgr.es/m/CAEudQAr=i3_Z4GvmediX900+sSySTeMkvuytYShhQqEwoGyvhA@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-10-29 11:41:39 +01:00
parent a13833c35f
commit 94f95d91b0
1 changed files with 6 additions and 6 deletions
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12
src/backend/utils/cache/relcache.c vendored
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@@ -4658,12 +4658,6 @@ CheckNNConstraintFetch(Relation relation)
break;
}
check[found].ccenforced = conform->conenforced;
check[found].ccvalid = conform->convalidated;
check[found].ccnoinherit = conform->connoinherit;
check[found].ccname = MemoryContextStrdup(CacheMemoryContext,
NameStr(conform->conname));
/* Grab and test conbin is actually set */
val = fastgetattr(htup,
Anum_pg_constraint_conbin,
@@ -4676,7 +4670,13 @@ CheckNNConstraintFetch(Relation relation)
/* detoast and convert to cstring in caller's context */
char *s = TextDatumGetCString(val);
check[found].ccenforced = conform->conenforced;
check[found].ccvalid = conform->convalidated;
check[found].ccnoinherit = conform->connoinherit;
check[found].ccname = MemoryContextStrdup(CacheMemoryContext,
NameStr(conform->conname));
check[found].ccbin = MemoryContextStrdup(CacheMemoryContext, s);
pfree(s);
found++;
}