From: Jan Glauber <jglauber@cavium.com>
Date: Mon, 12 Feb 2018 17:20:11 +0000 (+0100)
Subject: net: cavium: fix NULL pointer dereference in cavium_ptp_put
X-Git-Tag: v4.19~1547^2~29
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=07a2e1cf398187814b405665b19d36425ec7a962;p=platform%2Fkernel%2Flinux-rpi.git

net: cavium: fix NULL pointer dereference in cavium_ptp_put

Prevent a kernel panic on reboot if ptp_clock is NULL by checking
the ptp pointer before using it.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Fixes: 8c56df372bc1 ("net: add support for Cavium PTP coprocessor")
Cc: Radoslaw Biernacki <rad@semihalf.com>
Cc: Aleksey Makarov <aleksey.makarov@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/cavium/common/cavium_ptp.c b/drivers/net/ethernet/cavium/common/cavium_ptp.c
index c87c9c6..d59497a 100644
--- a/drivers/net/ethernet/cavium/common/cavium_ptp.c
+++ b/drivers/net/ethernet/cavium/common/cavium_ptp.c
@@ -75,6 +75,8 @@ EXPORT_SYMBOL(cavium_ptp_get);
 
 void cavium_ptp_put(struct cavium_ptp *ptp)
 {
+	if (!ptp)
+		return;
 	pci_dev_put(ptp->pdev);
 }
 EXPORT_SYMBOL(cavium_ptp_put);