net: wan: Add checks for NULL for utdm in undo_uhdlc_init and unmap_si_regs

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 Astra Linux on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: 8d68100 ("soc/fsl/qe: fix err handling of ucc_of_parse_tdm")
Signed-off-by: Esina Ekaterina <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Esina Ekaterina

drivers/net/wan/fsl_ucc_hdlc.c

@@ -1243,9 +1243,11 @@ static int ucc_hdlc_probe(struct platform_device *pdev)
 free_dev:
 	free_netdev(dev);
 undo_uhdlc_init:
-	iounmap(utdm->siram);
+	if (utdm)
+		iounmap(utdm->siram);
 unmap_si_regs:
-	iounmap(utdm->si_regs);
+	if (utdm)
+		iounmap(utdm->si_regs);
 free_utdm:
 	if (uhdlc_priv->tsa)
 		kfree(utdm);