5.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kangjie Lu <kjlu@xxxxxxx> commit 6734330654dac550f12e932996b868c6d0dcb421 upstream. In case ioremap fails, the fix returns -ENOMEM to avoid NULL pointer dereferences. Multiple places use port.membase. Signed-off-by: Kangjie Lu <kjlu@xxxxxxx> Cc: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/tty/serial/mxs-auart.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1686,6 +1686,10 @@ static int mxs_auart_probe(struct platfo s->port.mapbase = r->start; s->port.membase = ioremap(r->start, resource_size(r)); + if (!s->port.membase) { + ret = -ENOMEM; + goto out_disable_clks; + } s->port.ops = &mxs_auart_ops; s->port.iotype = UPIO_MEM; s->port.fifosize = MXS_AUART_FIFO_SIZE;