From: Christoph Hellwig <hch@infradead.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, 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
Subject: [Ocfs2-devel] [PATCH 1/7] 9P: Cast to loff_t before multiplying
Date: Wed, 7 Oct 2020 06:48:49 +0100 [thread overview]
Message-ID: <20201007054849.GA16556@infradead.org> (raw)
In-Reply-To: <20201004180428.14494-2-willy@infradead.org>
On Sun, Oct 04, 2020 at 07:04:22PM +0100, Matthew Wilcox (Oracle) wrote:
> 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) <willy@infradead.org>
> ---
> 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,
Given the may places where this issue shows up I think we really need
a vma_offset or similar helper for it. Much better than chasing missing
casts everywhere.
next prev parent reply other threads:[~2020-10-07 5:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-04 18:04 [Ocfs2-devel] [PATCH 0/7] Fix a pile of 4GB file problems on 32-bit Matthew Wilcox
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 1/7] 9P: Cast to loff_t before multiplying Matthew Wilcox
2020-10-07 5:48 ` Christoph Hellwig [this message]
2020-10-07 18:47 ` Matthew Wilcox
2020-10-26 17:14 ` Dominique Martinet
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 2/7] buffer: Promote to unsigned long long before shifting Matthew Wilcox
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 3/7] ceph: " Matthew Wilcox
2020-10-06 11:29 ` Jeff Layton
2020-10-06 17:20 ` Jeff Layton
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 4/7] ocfs2: " Matthew Wilcox
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 5/7] btrfs: " Matthew Wilcox
2020-10-09 14:18 ` Josef Bacik
2020-10-26 17:02 ` David Sterba
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 6/7] " Matthew Wilcox
2020-10-09 14:18 ` Josef Bacik
2020-10-26 16:35 ` David Sterba
2020-10-26 16:44 ` Matthew Wilcox
2020-10-26 17:03 ` David Sterba
2020-10-04 18:04 ` [Ocfs2-devel] [PATCH 7/7] btrfs: Promote to unsigned long long before multiplying Matthew Wilcox
2020-10-26 16:21 ` David Sterba
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