linux-kernel - [net PATCH] octeontx2-af: Fix pointer dereference before sanity check

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Message-ID: <20230607070255.2013980-1-saikrishnag@marvell.com>
Date:   Wed, 7 Jun 2023 12:32:55 +0530
From:   Sai Krishna <saikrishnag@...vell.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sgoutham@...vell.com>,
        <dan.carpenter@...aro.org>
CC:     Sai Krishna <saikrishnag@...vell.com>,
        Naveen Mamindlapalli <naveenm@...vell.com>
Subject: [net PATCH] octeontx2-af: Fix pointer dereference before sanity check

PTP pointer is being dereferenced before NULL, error check.
Fixed the same to avoid NULL dereference and smatch checker warning.

Fixes: 2ef4e45d99b1 ("octeontx2-af: Add PTP PPS Errata workaround on CN10K silicon")
Signed-off-by: Sai Krishna <saikrishnag@...vell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/ptp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
index 3411e2e47d46..6a7dfb181fa8 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/ptp.c
@@ -449,12 +449,12 @@ static void ptp_remove(struct pci_dev *pdev)
 	struct ptp *ptp = pci_get_drvdata(pdev);
 	u64 clock_cfg;
 
-	if (cn10k_ptp_errata(ptp) && hrtimer_active(&ptp->hrtimer))
-		hrtimer_cancel(&ptp->hrtimer);
-
 	if (IS_ERR_OR_NULL(ptp))
 		return;
 
+	if (cn10k_ptp_errata(ptp) && hrtimer_active(&ptp->hrtimer))
+		hrtimer_cancel(&ptp->hrtimer);
+
 	/* Disable PTP clock */
 	clock_cfg = readq(ptp->reg_base + PTP_CLOCK_CFG);
 	clock_cfg &= ~PTP_CLOCK_CFG_PTP_EN;
-- 
2.25.1