From e92fd6142de05627096a1e831140e5bd355e45be Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Sun, 2 Jan 2011 17:59:57 -0500
Subject: [PATCH] mkfs: avoid out of bounds access to sb in wsect

---
 mkfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mkfs.c b/mkfs.c
index 5f572cf..f227b5f 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -90,7 +90,9 @@ main(int argc, char *argv[])
   for(i = 0; i < nblocks + usedblocks; i++)
     wsect(i, zeroes);
 
-  wsect(1, &sb);
+  memset(buf, 0, sizeof(buf));
+  memmove(buf, &sb, sizeof(sb));
+  wsect(1, buf);
 
   rootino = ialloc(T_DIR);
   assert(rootino == ROOTINO);