xv6

commit e92fd6142de05627096a1e831140e5bd355e45be
parent 2ea6c764c34d3025b5f3121a0919fda7d1eb9b01
Author: Russ Cox <rsc@swtch.com>
Date:   Sun,  2 Jan 2011 17:59:57 -0500

mkfs: avoid out of bounds access to sb in wsect

Diffstat:
M
mkfs.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git 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);