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

[Ekaterina Esina]

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 at astralinux.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