netdev - [PATCH] net-wan: Add check for NULL for utdm in ucc_hdlc

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Date:   Fri, 23 Dec 2022 17:32:25 +0300
From:   Ekaterina Esina <eesina@...ralinux.ru>
To:     Zhao Qiang <qiang.zhao@....com>
Cc:     Ekaterina Esina <eesina@...ralinux.ru>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [PATCH] net-wan: Add check for NULL for utdm in ucc_hdlc_probe

If uhdlc_priv_tsa != 1 then utdm is not initialized.
And if ret != NULL then goto undo_uhdlc_init, where utdm is dereferenced.
Same if dev == NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Ekaterina Esina <eesina@...ralinux.ru>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 22edea6ca4b8..2ddb0f71e648 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -1243,7 +1243,9 @@ static int ucc_hdlc_probe(struct platform_device *pdev)
 free_dev:
 	free_netdev(dev);
 undo_uhdlc_init:
-	iounmap(utdm->siram);
+	if (utdm != NULL) {
+		iounmap(utdm->siram);
+	}
 unmap_si_regs:
 	iounmap(utdm->si_regs);
 free_utdm:
-- 
2.30.2