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>

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index c88e355f7635f61e59f58cb4acc617b84928e4e5..000eae2782b6e905aefa05980ef91c54b81a8274 100644 (file)
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -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);
 }
 
 /**