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isdn: mISDNinfineon: fix potential NULL pointer dereference

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In case ioremap fails, the fix returns -ENOMEM to avoid NULL
pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kangjie Lu 2019-03-08 23:49:34 -06:00 committed by David S. Miller
parent 69b51bbb03
commit d721fe99f6
1 changed files with 4 additions and 1 deletions
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5
drivers/isdn/hardware/mISDN/mISDNinfineon.c
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@ -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",