Re: [PATCH 3/7] ceph: Promote to unsigned long long before shifting
From: Jeff Layton <jlayton@kernel.org>
Date: 2020-10-06 17:20:49
Also in:
linux-btrfs, linux-fsdevel, lkml, ocfs2-devel, stable
On Sun, 2020-10-04 at 19:04 +0100, Matthew Wilcox (Oracle) wrote:
quoted hunk ↗ jump to hunk
On 32-bit systems, this shift will overflow for files larger than 4GB. Cc: stable@vger.kernel.org Fixes: 61f68816211e ("ceph: check caps in filemap_fault and page_mkwrite") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- fs/ceph/addr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 6ea761c84494..970e5a094035 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c@@ -1522,7 +1522,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_file_info *fi = vma->vm_file->private_data; struct page *pinned_page = NULL; - loff_t off = vmf->pgoff << PAGE_SHIFT; + loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT; int want, got, err; sigset_t oldset; vm_fault_t ret = VM_FAULT_SIGBUS;
I went ahead and merged this into the ceph-client/testing branch. Given how old this bug is, I don't see a real need to rush this into v5.9, but if we have any other patches going in before that ships, then it might be good to send this one along too. -- Jeff Layton [off-list ref]