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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Pavel Machek <pavel@denx.de>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Marc Kleine-Budde <mkl@pengutronix.de>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 362/846] can: rcar_canfd: rcar_canfd_channel_probe(): make sure we free CAN network device
Date:   Mon, 24 Jan 2022 19:37:59 +0100
Message-Id: <20220124184113.419073952@linuxfoundation.org>
In-Reply-To: <20220124184100.867127425@linuxfoundation.org>
References: <20220124184100.867127425@linuxfoundation.org>
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From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

[ Upstream commit 72b1e360572f9fa7d08ee554f1da29abce23f288 ]

Make sure we free CAN network device in the error path. There are
several jumps to fail label after allocating the CAN network device
successfully. This patch places the free_candev() under fail label so
that in failure path a jump to fail label frees the CAN network
device.

Fixes: 76e9353a80e9 ("can: rcar_canfd: Add support for RZ/G2L family")
Link: https://lore.kernel.org/all/20220106114801.20563-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/can/rcar/rcar_canfd.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index ff9d0f5ae0dd2..388521e70837f 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1640,8 +1640,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 	ndev = alloc_candev(sizeof(*priv), RCANFD_FIFO_DEPTH);
 	if (!ndev) {
 		dev_err(&pdev->dev, "alloc_candev() failed\n");
-		err = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 	priv = netdev_priv(ndev);
 
@@ -1735,8 +1734,8 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 
 fail_candev:
 	netif_napi_del(&priv->napi);
-	free_candev(ndev);
 fail:
+	free_candev(ndev);
 	return err;
 }
 
-- 
2.34.1