From b866018f54ad0670ee9b930a14ae6e8960b9f4bf Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Tue, 11 Oct 2022 14:57:16 +0100
Subject: [PATCH] Fix missing NUL terminator in stdio-common/scanf13 test

sscanf is only defined on nul terminated string input, but '\0' was
missing in this test which caused _IO_str_init_static_internal to
read OOB on the stack when computing the bounds of the string.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
---
 stdio-common/scanf13.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/stdio-common/scanf13.c b/stdio-common/scanf13.c
index 720224aa05..60aa62a26f 100644
--- a/stdio-common/scanf13.c
+++ b/stdio-common/scanf13.c
@@ -67,6 +67,7 @@ main (void)
   buf[2049] = 0x84;
   buf[2058] = '\t';
   buf[2059] = 'a';
+  buf[sizeof (buf) - 1] = '\0';
   if (sscanf (buf, "%ms%mc", &sp1, &sp2) != 2)
     FAIL ();
   else