staging: lustre: fix conctl.c issues found by Klocwork Insight tool

The function lst_test_add_ioctl is always copying lstio_tes_param
from userland even if the user doesn't send this data to LNet
selftest. Only consider lstio_tes_param data if lstio_tes_param_len
is not zero.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4629
Reviewed-on: http://review.whamcloud.com/9386
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Isaac Huang <he.huang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lnet/selftest/conctl.c b/drivers/staging/lustre/lnet/selftest/conctl.c
index 90b7771..714d14b 100644 (file)
--- a/drivers/staging/lustre/lnet/selftest/conctl.c
+++ b/drivers/staging/lustre/lnet/selftest/conctl.c
@@ -761,6 +761,11 @@ static int lst_test_add_ioctl(lstio_test_args_t *args)
                LIBCFS_ALLOC(param, args->lstio_tes_param_len);
                if (!param)
                        goto out;
+               if (copy_from_user(param, args->lstio_tes_param,
+                                  args->lstio_tes_param_len)) {
+                       rc = -EFAULT;
+                       goto out;
+               }
        }
 
        rc = -EFAULT;
@@ -769,9 +774,7 @@ static int lst_test_add_ioctl(lstio_test_args_t *args)
            copy_from_user(src_name, args->lstio_tes_sgrp_name,
                           args->lstio_tes_sgrp_nmlen) ||
            copy_from_user(dst_name, args->lstio_tes_dgrp_name,
-                          args->lstio_tes_dgrp_nmlen) ||
-           copy_from_user(param, args->lstio_tes_param,
-                          args->lstio_tes_param_len))
+                          args->lstio_tes_dgrp_nmlen))
                goto out;
 
        rc = lstcon_test_add(batch_name, args->lstio_tes_type,