[rtems commit] grtc.c: Fix Dereference before null check (CID #1399840)

[Joel Sherrill]

Module:    rtems
Branch:    master
Commit:    1fd56a96fcfb90ceae5eff2598a5ca375ff85109
Changeset: http://git.rtems.org/rtems/commit/?id=1fd56a96fcfb90ceae5eff2598a5ca375ff85109

Author:    Ryan Long <ryan.long at oarcorp.com>
Date:      Tue Feb 16 17:15:01 2021 -0500

grtc.c: Fix Dereference before null check (CID #1399840)

CID 1399840: Dereference before null check in grtc_ioctl().

Closes #4252

---

 bsps/shared/grlib/tmtc/grtc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/bsps/shared/grlib/tmtc/grtc.c b/bsps/shared/grlib/tmtc/grtc.c
index 44e9685..e9acea4 100644
--- a/bsps/shared/grlib/tmtc/grtc.c
+++ b/bsps/shared/grlib/tmtc/grtc.c
@@ -1532,7 +1532,7 @@ static rtems_device_driver grtc_ioctl(rtems_device_major_number major, rtems_dev
 	struct grtc_priv *pDev;
 	struct drvmgr_dev *dev;
 	rtems_libio_ioctl_args_t *ioarg = (rtems_libio_ioctl_args_t *)arg;
-	unsigned int *data = ioarg->buffer;
+	unsigned int *data;
 	int status,frm_len,i,ret;
 	struct grtc_ioc_buf_params *buf_arg;
 	struct grtc_ioc_config *cfg;
@@ -1556,6 +1556,8 @@ static rtems_device_driver grtc_ioctl(rtems_device_major_number major, rtems_dev
 	if (!ioarg)
 		return RTEMS_INVALID_NAME;
 
+        data = ioarg->buffer;
+
 	ioarg->ioctl_return = 0;
 	switch(ioarg->command) {
 		case GRTC_IOC_START: