[3.11.y.z extended stable] Patch "Btrfs: use right type to get real comparison" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    Btrfs: use right type to get real comparison

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From cfef87a8f01931065125bc75961f2b793ceae5cf Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu at oracle.com>
Date: Sun, 8 Jun 2014 19:04:13 +0800
Subject: Btrfs: use right type to get real comparison

commit cd857dd6bc2ae9ecea14e75a34e8a8fdc158e307 upstream.

We want to make sure the point is still within the extent item, not to verify
the memory it's pointing to.

Signed-off-by: Liu Bo <bo.li.liu at oracle.com>
Signed-off-by: Chris Mason <clm at fb.com>
Cc: David Sterba <dsterba at suse.cz>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/btrfs/backref.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 8bc5e8ccb091..2b3d7ba4ad33 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1388,7 +1388,7 @@ static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer *eb,
 			*out_eiref = (struct btrfs_extent_inline_ref *)(ei + 1);
 		}
 		*ptr = (unsigned long)*out_eiref;
-		if ((void *)*ptr >= (void *)ei + item_size)
+		if ((unsigned long)(*ptr) >= (unsigned long)ei + item_size)
 			return -ENOENT;
 	}

--
1.9.1