xnu-3247.1.106.tar.gz

[apple/xnu.git] / bsd / kern / tty_pty.c

diff --git a/bsd/kern/tty_pty.c b/bsd/kern/tty_pty.c
index f4bb4dac6f80ef6aedfb338ac0b61e86699747ed..7c4f14e6a980c2297b1c1673fa32f877379a56cf 100644 (file)
--- a/bsd/kern/tty_pty.c
+++ b/bsd/kern/tty_pty.c
@@ -148,11 +148,13 @@ pty_init(int n_ptys)
        int i;
        int j;
 
+       n_ptys = min(n_ptys, NPTY); /* clamp to avoid pt_ioctl overflow */
+
        /* create the pseudo tty device nodes */
        for (j = 0; j < 10; j++) {
                for (i = 0; i < HEX_BASE; i++) {
                        int m = j * HEX_BASE + i;
-                       if (m == n_ptys)
+                       if (m >= n_ptys)
                                goto done;
                        pt_ioctl[m].pt_devhandle = devfs_make_node(makedev(TTY_MAJOR, m),
                                                                   DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,