From 7e6340bf9a138c33ee81a47c8c6620eaeb959cb8 Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Thu, 24 Oct 2013 14:08:07 +0000 Subject: [PATCH] eCryptfs: fix 32 bit corruption issue (LP: #1243636) Shifting page->index on 32 bit systems was overflowing, causing data corruption of > 4GB files. Fix this by casting it first. Signed-off-by: Colin Ian King --- fs/ecryptfs/crypto.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index d107576..40db688 100644 --- 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); } /** -- 1.8.1.2