From 7b368abe5174317220183c7ecef31155ecc55e38 Mon Sep 17 00:00:00 2001
From: Markus Uhlin <markus@nifty-networks.net>
Date: Wed, 1 May 2024 15:06:46 +0200
Subject: Added check

---
 FICS/command.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'FICS')

diff --git a/FICS/command.c b/FICS/command.c
index 3e85169..e934dcc 100644
--- a/FICS/command.c
+++ b/FICS/command.c
@@ -188,8 +188,16 @@ alias_substitute(alias_type *alias_list, int num_alias, char *com_str,
 	atpos = strchr(aliasval, '@');
 
 	if (atpos != NULL) {
-		strncpy(outalias, aliasval, atpos - aliasval);
-		outalias[atpos - aliasval] = '\0';
+		const size_t diff = atpos - aliasval;
+
+		if (diff >= size) { // XXX
+			warnx("%s: diff out of bounds!", __func__);
+			return;
+		}
+
+		strncpy(outalias, aliasval, diff);
+		outalias[diff] = '\0';
+
 		mstrlcat(outalias, s, size);
 		mstrlcat(outalias, atpos + 1, size);
 	} else {
-- 
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