| Message ID | 20230426012721.6856-1-m202171830@hust.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | serial: arc_uart: fix of_iomap leak in `arc_serial_probe` | expand |
On Tue, Apr 25, 2023 at 8:27 PM Ke Zhang <m202171830@hust.edu.cn> wrote: > > Smatch reports: > > drivers/tty/serial/arc_uart.c:631 arc_serial_probe() warn: > 'port->membase' from of_iomap() not released on lines: 631. > > In arc_serial_probe(), if uart_add_one_port() fails, > port->membase is not released, which would cause a resource leak. > > To fix this, I replace of_iomap with devm_of_iomap. How about use devm_platform_ioremap_resource() instead (or any ioremap variant) as that is preferred over of_iomap(). Rob > > Fixes: 8dbe1d5e09a7 ("serial/arc: inline the probe helper") > Signed-off-by: Ke Zhang <m202171830@hust.edu.cn> > Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn> > --- > This issue is found by static analysis and remains untested. > --- > drivers/tty/serial/arc_uart.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c > index 59e25f2b6632..be1f3c379382 100644 > --- a/drivers/tty/serial/arc_uart.c > +++ b/drivers/tty/serial/arc_uart.c > @@ -606,10 +606,11 @@ static int arc_serial_probe(struct platform_device *pdev) > } > uart->baud = val; > > - port->membase = of_iomap(np, 0); > - if (!port->membase) > + port->membase = devm_of_iomap(&pdev->dev, np, 0, NULL); > + if (IS_ERR(port->membase)) { > /* No point of dev_err since UART itself is hosed here */ > return -ENXIO; If an errno was returned, you should return that errno and not a different one. Rob
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c index 59e25f2b6632..be1f3c379382 100644 --- a/drivers/tty/serial/arc_uart.c +++ b/drivers/tty/serial/arc_uart.c @@ -606,10 +606,11 @@ static int arc_serial_probe(struct platform_device *pdev) } uart->baud = val; - port->membase = of_iomap(np, 0); - if (!port->membase) + port->membase = devm_of_iomap(&pdev->dev, np, 0, NULL); + if (IS_ERR(port->membase)) { /* No point of dev_err since UART itself is hosed here */ return -ENXIO; + } port->irq = irq_of_parse_and_map(np, 0);
Smatch reports: drivers/tty/serial/arc_uart.c:631 arc_serial_probe() warn: 'port->membase' from of_iomap() not released on lines: 631. In arc_serial_probe(), if uart_add_one_port() fails, port->membase is not released, which would cause a resource leak. To fix this, I replace of_iomap with devm_of_iomap. Fixes: 8dbe1d5e09a7 ("serial/arc: inline the probe helper") Signed-off-by: Ke Zhang <m202171830@hust.edu.cn> Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn> --- This issue is found by static analysis and remains untested. --- drivers/tty/serial/arc_uart.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)