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Date: Fri, 8 Mar 2019 23:46:04 -0600 From: Kangjie Lu <kjlu@....edu> To: kjlu@....edu Cc: pakki001@....edu, Karsten Keil <isdn@...ux-pingi.de>, "David S. Miller" <davem@...emloft.net>, Jia-Ju Bai <baijiaju1990@...il.com>, "Gustavo A. R. Silva" <gustavo@...eddedor.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] isdn: hfcpci: fix potential NULL pointer dereference In case ioremap fails, the fix reports an error and returns. Signed-off-by: Kangjie Lu <kjlu@....edu> --- drivers/isdn/hardware/mISDN/hfcpci.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c index ebb3fa2e1d00..b400d6528a56 100644 --- a/drivers/isdn/hardware/mISDN/hfcpci.c +++ b/drivers/isdn/hardware/mISDN/hfcpci.c @@ -2036,6 +2036,11 @@ 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)) { + printk(KERN_WARNING + "HFC-PCI: ioremap failed!\n"); + 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
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