From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox (Oracle) Date: Sun, 4 Oct 2020 19:04:22 +0100 Subject: [Ocfs2-devel] [PATCH 1/7] 9P: Cast to loff_t before multiplying In-Reply-To: <20201004180428.14494-1-willy@infradead.org> References: <20201004180428.14494-1-willy@infradead.org> Message-ID: <20201004180428.14494-2-willy@infradead.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , ericvh@gmail.com, lucho@ionkov.net, viro@zeniv.linux.org.uk, jlayton@kernel.org, idryomov@gmail.com, mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org, clm@fb.com, josef@toxicpanda.com, dsterba@suse.com, stable@vger.kernel.org On 32-bit systems, this multiplication will overflow for files larger than 4GB. Cc: stable at vger.kernel.org Fixes: fb89b45cdfdc ("9P: introduction of a new cache=mmap model.") Signed-off-by: Matthew Wilcox (Oracle) --- fs/9p/vfs_file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 3576123d8299..6d97b6b4d34b 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -612,9 +612,9 @@ static void v9fs_mmap_vm_close(struct vm_area_struct *vma) struct writeback_control wbc = { .nr_to_write = LONG_MAX, .sync_mode = WB_SYNC_ALL, - .range_start = vma->vm_pgoff * PAGE_SIZE, + .range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE, /* absolute end, byte at end included */ - .range_end = vma->vm_pgoff * PAGE_SIZE + + .range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE + (vma->vm_end - vma->vm_start - 1), }; -- 2.28.0