From: Anselm R. Garbe <arg@suckless.org>
Date: Thu, 10 May 2007 11:47:44 +0000 (+0200)
Subject: fixed a potential security flaw
X-Git-Url: https://git.danieliu.xyz/?a=commitdiff_plain;h=b8bccb4ac5222a01ecd6a5f82997ea2ee3b84b8b;p=dwm.git

fixed a potential security flaw
---

diff --git a/client.c b/client.c
index 03d158f..64da343 100644
--- a/client.c
+++ b/client.c
@@ -365,16 +365,18 @@ updatetitle(Client *c) {
 		XGetWMName(dpy, c->win, &name);
 	if(!name.nitems)
 		return;
-	if(name.encoding == XA_STRING)
-		strncpy(c->name, (char *)name.value, sizeof c->name);
+	if(name.encoding == XA_STRING) {
+		strncpy(c->name, (char *)name.value, sizeof c->name - 1);
+	}
 	else {
 		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 		&& n > 0 && *list)
 		{
-			strncpy(c->name, *list, sizeof c->name);
+			strncpy(c->name, *list, sizeof c->name - 1);
 			XFreeStringList(list);
 		}
 	}
+	c->name[sizeof c->name - 1] = '\0';
 	XFree(name.value);
 }