IB/hfi1: info leak in get_ctxt_info()

The cinfo struct has a hole after the last struct member so we need to
zero it out.  Otherwise we disclose some uninitialized stack data.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/staging/rdma/hfi1/file_ops.c b/drivers/staging/rdma/hfi1/file_ops.c
index 469861750b762a86960495c03932cb1be964b7de..2c43ca5a379ba4065eeaa06b169fde01daabfc33 100644 (file)
--- a/drivers/staging/rdma/hfi1/file_ops.c
+++ b/drivers/staging/rdma/hfi1/file_ops.c
@@ -1181,6 +1181,7 @@ static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len)
        struct hfi1_filedata *fd = fp->private_data;
        int ret = 0;
 
+       memset(&cinfo, 0, sizeof(cinfo));
        ret = hfi1_get_base_kinfo(uctxt, &cinfo);
        if (ret < 0)
                goto done;