Fix strtonum() usage when parsing /proc/self/stat on Linux.

Bug #630

diff --git a/src/ttyname.c b/src/ttyname.c
index 4a95b625d8947a6f143d7fc6a6be82b632e024c1..1996a250a26d5d296cb5068ddeba2447fe1122f0 100644 (file)
--- a/src/ttyname.c
+++ b/src/ttyname.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2013 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2012-2014 Todd C. Miller <Todd.Miller@courtesan.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -441,10 +441,12 @@ get_process_ttyname(void)
        if (len != -1) {
            /* Field 7 is the tty dev (0 if no tty) */
            char *cp = line;
+           char *ep = line;
            const char *errstr;
-           int field = 1;
-           while (*cp != '\0') {
-               if (*cp++ == ' ') {
+           int field = 0;
+           while (*++ep != '\0') {
+               if (*ep == ' ') {
+                   *ep = '\0';
                    if (++field == 7) {
                        dev_t tdev = strtonum(cp, INT_MIN, INT_MAX, &errstr);
                        if (errstr) {
@@ -455,6 +457,7 @@ get_process_ttyname(void)
                            tty = sudo_ttyname_dev(tdev);
                        break;
                    }
+                   cp = ep + 1;
                }
            }
        }