linux-kernel - [PATCH 3.11 34/94] eCryptfs: fix 32 bit corruption issue

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Date:	Fri,  8 Nov 2013 22:51:40 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
	Lars Duesing <lars.duesing@...elotsweb.de>,
	Tyler Hicks <tyhicks@...onical.com>
Subject: [PATCH 3.11 34/94] eCryptfs: fix 32 bit corruption issue

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

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

From: Colin Ian King <colin.king@...onical.com>

commit 43b7c6c6a4e3916edd186ceb61be0c67d1e0969e upstream.

Shifting page->index on 32 bit systems was overflowing, causing
data corruption of > 4GB files. Fix this by casting it first.

https://launchpad.net/bugs/1243636

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Reported-by: Lars Duesing <lars.duesing@...elotsweb.de>
Signed-off-by: Tyler Hicks <tyhicks@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ecryptfs/crypto.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -408,7 +408,7 @@ static loff_t lower_offset_for_page(stru
 				    struct page *page)
 {
 	return ecryptfs_lower_header_size(crypt_stat) +
-	       (page->index << PAGE_CACHE_SHIFT);
+	       ((loff_t)page->index << PAGE_CACHE_SHIFT);
 }
 
 /**


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