linux-kernel - [PATCH v2] isdn: hfcpci: fix potential NULL pointer dereference

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Message-Id: <20190311053436.10747-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 00:34:34 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Karsten Keil <isdn@...ux-pingi.de>,
        "David S. Miller" <davem@...emloft.net>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] isdn: hfcpci: fix potential NULL pointer dereference

In case ioremap fails, the fix releases resources and returns.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/isdn/hardware/mISDN/hfcpci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index ebb3fa2e1d00..d1d53c5de3c0 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -2036,6 +2036,12 @@ setup_hw(struct hfc_pci *hc)
 	       "HFC-PCI: defined at mem %#lx fifo %#lx(%#lx) IRQ %d HZ %d\n",
 	       (u_long) hc->hw.pci_io, (u_long) hc->hw.fifos,
 	       (u_long) hc->hw.dmahandle, hc->irq, HZ);
+	if (unlikely(!hc->hw.pci_io)) {
+		pci_free_consistent(hc->pdev, 0x8000, hc->hw.fifos,
+				    hc->hw.dmahandle);
+		return 1;
+	}
+
 	/* enable memory mapped ports, disable busmaster */
 	pci_write_config_word(hc->pdev, PCI_COMMAND, PCI_ENA_MEMIO);
 	hc->hw.int_m2 = 0;
-- 
2.17.1