BUG/MINOR: cfgparse: Add OOM check for calloc() in cfg_parse_listen()

This commit adds a missing out-of-memory (OOM) check
after the call to `calloc()` in `cfg_parse_listen()`.
If memory allocation fails, an alert is logged, error
codes are set, and parsing is aborted to prevent
undefined behavior.

Co-authored-by: Christian Norbert Menges <christian.norbert.menges@sap.com>

Author: 2 people

src/cfgparse-listen.c

@@ -2029,6 +2029,12 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 					len += strlen(args[i]) + 1;
 
 				desc = d = calloc(1, len);
+				if (unlikely(!d)) {
+					ha_alert("parsing [%s:%d]: '%s %s' : memory allocation failed\n",
+							 file, linenum, args[0], args[1]);
+					err_code |= ERR_ALERT | ERR_FATAL;
+					goto out;
+				}
 
 				d += snprintf(d, desc + len - d, "%s", args[2]);
 				for (i = 3; *args[i]; i++)