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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
mihailescu2m · Mar 10, 2019 · d721fe9 · d721fe9
1 parent 69b51bb
commit d721fe9
Showing 1 changed file with 4 additions and 1 deletion.
diff --git 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",