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Avoid null pointer dereference crash after OOM in Snowball stemmers.

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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
This commit is contained in:
Tom Lane 2025-02-18 21:23:59 -05:00
parent 49a450892a
commit 7edd2cbc53
1 changed files with 1 additions and 1 deletions
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2
src/backend/snowball/libstemmer/api.c
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@ -34,7 +34,7 @@ error:
extern void SN_close_env(struct SN_env * z, int S_size) extern void SN_close_env(struct SN_env * z, int S_size)
{ {
if (z == NULL) return; if (z == NULL) return;
if (S_size) if (z->S)
{ {
int i; int i;
for (i = 0; i < S_size; i++) for (i = 0; i < S_size; i++)