diff --git a/grub-core/term/terminfo.c b/grub-core/term/terminfo.c
index 0e9de7f8f..cd7200803 100644
--- a/grub-core/term/terminfo.c
+++ b/grub-core/term/terminfo.c
@@ -398,7 +398,7 @@ grub_terminfo_getwh (struct grub_term_output *term)
 }
 
 static void
-grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
+grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len, int max_len,
 		       int (*readkey) (struct grub_term_input *term))
 {
   int c;
@@ -414,6 +414,9 @@ grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
     if (c == -1)						\
       return;							\
 								\
+    if (*len >= max_len)                                       \
+      return;                                                   \
+                                                                \
     keys[*len] = c;						\
     (*len)++;							\
   }
@@ -602,8 +605,8 @@ grub_terminfo_getkey (struct grub_term_input *termi)
       return ret;
     }
 
-  grub_terminfo_readkey (termi, data->input_buf,
-			 &data->npending, data->readkey);
+  grub_terminfo_readkey (termi, data->input_buf, &data->npending,
+			 GRUB_TERMINFO_READKEY_MAX_LEN, data->readkey);
 
 #if defined(__powerpc__) && defined(GRUB_MACHINE_IEEE1275)
   if (data->npending == 1 && data->input_buf[0] == GRUB_TERM_ESC