ceph: promote to unsigned long long before shifting

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>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 137c0a5..35c83f6 100644 (file)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1471,7 +1471,7 @@ 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;