1 files changed, 5 insertions, 3 deletions

diff --git a/shell/cttyhack.c b/shell/cttyhack.c
index 4261289b4..37ea13723 100644
--- a/shell/cttyhack.c
+++ b/shell/cttyhack.c
@@ -122,10 +122,12 @@ int cttyhack_main(int argc UNUSED_PARAM, char **argv)
                 do {
 #ifdef __linux__
                         int s = open_read_close("/sys/class/tty/console/active",
-                                console + 5, sizeof(console) - 5 - 1);
+                                console + 5, sizeof(console) - 5);
                         if (s > 0) {
-                                /* found active console via sysfs (Linux 2.6.38+) */
-                                console[5 + s] = '\0';
+                                /* found active console via sysfs (Linux 2.6.38+)
+                                 * sysfs string looks like "ttyS0\n" so zap the newline:
+                                 */
+                                console[4 + s] = '\0';
                                 break;
                         }