From: Kangjie Lu Date: Sat, 9 Mar 2019 05:49:34 +0000 (-0600) Subject: isdn: mISDNinfineon: fix potential NULL pointer dereference X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=d721fe99f6ada070ae8fc0ec3e01ce5a42def0d9;p=people%2Fjulieng%2Flinux-arm.git isdn: mISDNinfineon: fix potential NULL pointer dereference In case ioremap fails, the fix returns -ENOMEM to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu Signed-off-by: David S. Miller --- diff --git a/drivers/isdn/hardware/mISDN/mISDNinfineon.c b/drivers/isdn/hardware/mISDN/mISDNinfineon.c index 3e01012be4ab..0fe6ddcb3fdc 100644 --- a/drivers/isdn/hardware/mISDN/mISDNinfineon.c +++ b/drivers/isdn/hardware/mISDN/mISDNinfineon.c @@ -712,8 +712,11 @@ setup_io(struct inf_hw *hw) (ulong)hw->addr.start, (ulong)hw->addr.size); return err; } - if (hw->ci->addr_mode == AM_MEMIO) + if (hw->ci->addr_mode == AM_MEMIO) { hw->addr.p = ioremap(hw->addr.start, hw->addr.size); + if (unlikely(!hw->addr.p)) + return -ENOMEM; + } hw->addr.mode = hw->ci->addr_mode; if (debug & DEBUG_HW) pr_notice("%s: IO addr %lx (%lu bytes) mode%d\n",