staging: lustre: potential underflow in mdc_iocontrol()

Smatch complains that "data->ioc_plen2" is a user controlled value and,
since we cast to signed int, the limit check can underflow.  It's not
very serious because probably the copy_to_user() would return -EFAULT
on every arch that matters instead of creating an info leak.  Also I
haven't followed it through to see if the value is really user
controlled.

But definitely it would be safer to cast to unsigned so let's do that.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index 3b0f245..05d05ce 100644 (file)
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -1908,8 +1908,8 @@ static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
 
                /* copy UUID */
                if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
-                                    min((int) data->ioc_plen2,
-                                        (int) sizeof(struct obd_uuid)))) {
+                                min_t(size_t, data->ioc_plen2,
+                                              sizeof(struct obd_uuid)))) {
                        rc = -EFAULT;
                        goto out;
                }
@@ -1921,8 +1921,8 @@ static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
                        goto out;
 
                if (copy_to_user(data->ioc_pbuf1, &stat_buf,
-                                    min((int) data->ioc_plen1,
-                                        (int) sizeof(stat_buf)))) {
+                                min_t(size_t, data->ioc_plen1,
+                                              sizeof(stat_buf)))) {
                        rc = -EFAULT;
                        goto out;
                }