[PATCH net-next v2 3/3] net: ti: icss-iep: Fix possible NULL pointer dereference for perout request

[Meghana Malladi <m-malladi@ti.com>]

Whenever there is a perout request from the user application,
kernel receives req structure containing the configuration info
for that req. Add NULL pointer handling for perout request if
that req struct points to NULL.

Fixes: e5b456a14215 ("net: ti: icss-iep: Add pwidth configuration for perout signal")
Signed-off-by: Meghana Malladi <m-malladi@ti.com>
Reviewed-by: Simon Horman <horms@kernel.org>
---

Changes from v1(v2-v1):
- Collected RB tag from Simon Horman <horms@kernel.org>

 drivers/net/ethernet/ti/icssg/icss_iep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/icssg/icss_iep.c b/drivers/net/ethernet/ti/icssg/icss_iep.c
index b4a34c57b7b4..aeebdc4c121e 100644
--- a/drivers/net/ethernet/ti/icssg/icss_iep.c
+++ b/drivers/net/ethernet/ti/icssg/icss_iep.c
@@ -498,6 +498,10 @@ static int icss_iep_perout_enable(struct icss_iep *iep,
 {
 	int ret = 0;
 
+	/* Return error if the req is NULL */
+	if (!req)
+		return -EINVAL;
+
 	/* Reject requests with unsupported flags */
 	if (req->flags & ~(PTP_PEROUT_DUTY_CYCLE |
 			  PTP_PEROUT_PHASE))
-- 
2.43.0