Commit 43b7c6c6 authored Oct 24, 2013 by Colin Ian King Committed by Tyler Hicks Oct 24, 2013

eCryptfs: fix 32 bit corruption issue

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@canonical.com>
Reported-by: Lars Duesing <lars.duesing@camelotsweb.de>
Cc: stable@vger.kernel.org # v3.11+
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

parent 3edc8376

fs/ecryptfs/crypto.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -408,7 +408,7 @@ static loff_t lower_offset_for_page(struct ecryptfs_crypt_stat *crypt_stat,
		struct page *page)
		{
		return ecryptfs_lower_header_size(crypt_stat) +
		(page->index << PAGE_CACHE_SHIFT);
		((loff_t)page->index << PAGE_CACHE_SHIFT);
		}

		/**