From 43b7c6c6a4e3916edd186ceb61be0c67d1e0969e 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 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 Reported-by: Lars Duesing Cc: stable@vger.kernel.org # v3.11+ Signed-off-by: Tyler Hicks --- 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 c88e355f7635..000eae2782b6 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); } /** -- 2.20.1