Don't try to translate NULL in GetConfigOptionByNum().

anarazel · anarazel · commit 3ac7d024122f · 2022-03-23T13:05:59.000-07:00
Noticed via -fsanitize=undefined. Introduced when a few columns in GetConfigOptionByNum() / pg_settings started to be translated in 72be8c2 / PG 12. Backpatch to all affected branches, for the same reasons as 46ab07f. Discussion: https://postgr.es/m/20220323173537.ll7klrglnp4gn2um@alap3.anarazel.de Backpatch: 12-
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
@@ -9797,7 +9797,7 @@ GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
 	values[4] = _(conf->short_desc);
 
 	/* extra_desc */
-	values[5] = _(conf->long_desc);
+	values[5] = conf->long_desc != NULL ? _(conf->long_desc) : NULL;
 
 	/* context */
 	values[6] = GucContext_Names[conf->context];
