Ocfs2 devel - Aug 2013 - [patch] ocfs2: fix recent memory corruption bug

The pointer math in 6fdf3af1d2 "ocfs2: fix null pointer dereference in
ocfs2_dir_foreach_blk_id()" isn't correct so it will zero out the wrong
memory.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
---
Static checker stuff.

diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index c91d986..6942c22 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -2157,8 +2157,7 @@ int ocfs2_empty_dir(struct inode *inode)
 		.ctx.pos = 0,
 	};
 
-	memset(&priv + sizeof(struct dir_context), 0,
-	       sizeof(priv) - sizeof(struct dir_context));
+	memset(&priv.seen_dot, 0, sizeof(priv) - sizeof(struct dir_context));
 
 	if (ocfs2_dir_indexed(inode)) {
 		ret = ocfs2_empty_dir_dx(inode, &priv);

On Thu, Aug 01, 2013 at 04:55:26PM +0300, Dan Carpenter
wrote:
> The pointer math in 6fdf3af1d2 "ocfs2: fix null pointer dereference in
> ocfs2_dir_foreach_blk_id()" isn't correct so it will zero out the
wrong
> memory.
> 
I sent this patch prematurely...  Really the memset is not needed
because the values are already initialized to zero.  Let me send a
v2 patch that removes the memset.

Sorry, I just wanted to fix this right away because of the memory
corruption.

regards,
dan carpenter