protect against BSD pty w/ 20-bit minor

2004-02-24 04:14:36 +00:00
parent 8620fc26cf
commit fbadfaa850
3 changed files with 4 additions and 0 deletions
--- a/proc/devname.c
+++ b/proc/devname.c
@ -146,6 +146,7 @@ static int guess_name(char *restrict const buf, unsigned maj, unsigned min){
    }
    tmpmin = min & 0x3f;  /* FALL THROUGH */
  case   3:      /* /dev/[pt]ty[p-za-o][0-9a-z] is 936 */
+    if(tmpmin > 255) return 0;   // should never happen; array index protection
    t0 = "pqrstuvwxyzabcde"[tmpmin>>4];
    t1 = "0123456789abcdef"[tmpmin&0x0f];
    sprintf(buf, "/dev/tty%c%c", t0, t1);