linux-kernel - [PATCH 3.11 012/128] Btrfs: use right type to get real comparison

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Date:	Thu, 24 Jul 2014 10:44:21 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Liu Bo <bo.li.liu@...cle.com>, Chris Mason <clm@...com>,
	David Sterba <dsterba@...e.cz>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 012/128] Btrfs: use right type to get real comparison

3.11.10.14 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo.li.liu@...cle.com>

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@...cle.com>
Signed-off-by: Chris Mason <clm@...com>
Cc: David Sterba <dsterba@...e.cz>
Signed-off-by: Luis Henriques <luis.henriques@...onical.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

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