Fix bounds checking in wsmux_getmux().

diff --git a/sys/dev/wscons/wsmux.c b/sys/dev/wscons/wsmux.c
index f483453..3176c6e 100644 (file)
--- a/sys/dev/wscons/wsmux.c
+++ b/sys/dev/wscons/wsmux.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: wsmux.c,v 1.58 2024/05/29 06:39:13 jsg Exp $  */
+/*     $OpenBSD: wsmux.c,v 1.59 2024/08/16 12:22:17 miod Exp $ */
 /*      $NetBSD: wsmux.c,v 1.37 2005/04/30 03:47:12 augustss Exp $      */
 
 /*
@@ -143,7 +143,7 @@ wsmux_getmux(int n)
        struct wsmux_softc **new, **old;
        int i;
 
-       if (n >= WSMUX_MAXDEV)
+       if (n < 0 || n >= WSMUX_MAXDEV)
                return (NULL);
 
        /* Make sure there is room for mux n in the table */