- (djm) Use ttyname() to determine name of tty returned by openpty()

   rather then risking overflow. Patch from Marek Michalkiewicz
   <marekm@amelek.gda.pl>

1 files changed, 7 insertions, 3 deletions

diff --git a/pty.c b/pty.c
index e71bceb80..4b9370ce5 100644
--- a/pty.c
+++ b/pty.c
@@ -49,15 +49,19 @@ pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 {
 #if defined(HAVE_OPENPTY) || defined(BSD4_4)
         /* openpty(3) exists in OSF/1 and some other os'es */
-        char buf[64];
+        char *name;
         int i;
 
-        i = openpty(ptyfd, ttyfd, buf, NULL, NULL);
+        i = openpty(ptyfd, ttyfd, NULL, NULL, NULL);
         if (i < 0) {
                 error("openpty: %.100s", strerror(errno));
                 return 0;
         }
-        strlcpy(namebuf, buf, namebuflen);      /* possible truncation */
+        name = ttyname(*ttyfd);
+        if (!name)
+                fatal("openpty returns device for which ttyname fails.");
+
+        strlcpy(namebuf, name, namebuflen);     /* possible truncation */
         return 1;
 #else /* HAVE_OPENPTY */
 #ifdef HAVE__GETPTY