Check the length of the username in DefaultIsUser.

sadiepowell · sadiepowell · commit aaceb4fd9aae · 2026-01-20T20:59:33.000Z
diff --git a/src/helperfuncs.cpp b/src/helperfuncs.cpp
@@ -277,7 +277,7 @@ bool InspIRCd::DefaultIsNick(const std::string_view& n)
 /* return true for good username, false else */
 bool InspIRCd::DefaultIsUser(const std::string_view& n)
 {
-	if (n.empty())
+	if (n.empty() || n.length() > ServerInstance->Config->Limits.MaxUser)
 		return false;
 
 	for (const auto chr : n)

Original file line number	Diff line number	Diff line change
`@@ -277,7 +277,7 @@ bool InspIRCd::DefaultIsNick(const std::string_view& n)`
`277`	`277`	`/* return true for good username, false else */`
`278`	`278`	`bool InspIRCd::DefaultIsUser(const std::string_view& n)`
`279`	`279`	`{`
`280`		`- if (n.empty())`
	`280`	`+ if (n.empty() \|\| n.length() > ServerInstance->Config->Limits.MaxUser)`
`281`	`281`	`return false;`
`282`	`282`
`283`	`283`	`for (const auto chr : n)`