diff options
| author | Kangjie Lu <kjlu@umn.edu> | 2019-03-12 00:54:55 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-03-12 14:36:02 -0700 |
| commit | 10010493c1261ca3d7444d372f281009890a5ff7 (patch) | |
| tree | b0e0af67f213a58f5c05a551fcd55d261eaf8b3b /drivers/isdn | |
| parent | a3b1933d34d5bb26d7503752e3528315a9e28339 (diff) | |
| download | lwn-10010493c1261ca3d7444d372f281009890a5ff7.tar.gz lwn-10010493c1261ca3d7444d372f281009890a5ff7.zip | |
isdn: hfcpci: fix potential NULL pointer dereference
In case ioremap fails, the fix releases resources and returns.
The following printk is for logging purpose and thus is
preserved.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn')
| -rw-r--r-- | drivers/isdn/hardware/mISDN/hfcpci.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c index ebb3fa2e1d00..362aa5450a5e 100644 --- a/drivers/isdn/hardware/mISDN/hfcpci.c +++ b/drivers/isdn/hardware/mISDN/hfcpci.c @@ -2032,10 +2032,19 @@ setup_hw(struct hfc_pci *hc) hc->hw.fifos = buffer; pci_write_config_dword(hc->pdev, 0x80, hc->hw.dmahandle); hc->hw.pci_io = ioremap((ulong) hc->hw.pci_io, 256); + if (unlikely(!hc->hw.pci_io)) { + printk(KERN_WARNING + "HFC-PCI: Error in ioremap for PCI!\n"); + pci_free_consistent(hc->pdev, 0x8000, hc->hw.fifos, + hc->hw.dmahandle); + return 1; + } + printk(KERN_INFO "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); + /* enable memory mapped ports, disable busmaster */ pci_write_config_word(hc->pdev, PCI_COMMAND, PCI_ENA_MEMIO); hc->hw.int_m2 = 0; |