From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 19 Feb 2025 02:23:59 +0000 (-0500)
Subject: Avoid null pointer dereference crash after OOM in Snowball stemmers.
X-Git-Tag: REL_13_21~64
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=197427fb3f0bcfa0d40c92291f2dfd3ea1c167b8;p=thirdparty%2Fpostgresql.git

Avoid null pointer dereference crash after OOM in Snowball stemmers.

Absorb upstream bug fix (their commit
e322673a841d9abd69994ae8cd20e191090b6ef4), which prevents a null
pointer dereference crash if SN_create_env() gets a malloc failure
at just the wrong point.

Thanks to Maksim Korotkov for discovering the null-pointer
bug and submitting the fix to upstream snowball.

Reported-by: Maksim Korotkov <m.korotkov@postgrespro.ru>
Author: Maksim Korotkov <m.korotkov@postgrespro.ru>
Discussion: https://postgr.es/m/1d1a46-67ab1000-21-80c451@83151435
Backpatch-through: 13
---

diff --git a/src/backend/snowball/libstemmer/api.c b/src/backend/snowball/libstemmer/api.c
index 530b427a466..1f1fb79d11f 100644
--- a/src/backend/snowball/libstemmer/api.c
+++ b/src/backend/snowball/libstemmer/api.c
@@ -40,7 +40,7 @@ error:
 extern void SN_close_env(struct SN_env * z, int S_size)
 {
     if (z == NULL) return;
-    if (S_size)
+    if (z->S)
     {
         int i;
         for (i = 0; i < S_size; i++)