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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2021-06-08 16:42:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-09 14:40:48 +0200 |
| commit | 7c3e8d9df265bd0bdf6e328174cdfba26eb22f1c (patch) | |
| tree | 1922b3ae5ce8a097b22546dacfc2b35173b427d5 /drivers/tty/serial/8250 | |
| parent | Linux 5.13-rc4 (diff) | |
| download | linux-7c3e8d9df265bd0bdf6e328174cdfba26eb22f1c.tar.xz linux-7c3e8d9df265bd0bdf6e328174cdfba26eb22f1c.zip | |
serial: 8250_exar: Avoid NULL pointer dereference at ->exit()
It's possible that during ->exit() the private_data is NULL,
for instance when there was no GPIO device instantiated.
Due to this we may not dereference it. Add a respective check.
Note, for now ->exit() only makes sense when GPIO device
was instantiated, that's why we may use the check for entire
function.
Fixes: 81171e7d31a6 ("serial: 8250_exar: Constify the software nodes")
Reported-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20210608144239.12697-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_exar.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 2f49c580139b..bd4e9f6ac29c 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -553,7 +553,11 @@ static void pci_xr17v35x_exit(struct pci_dev *pcidev) { struct exar8250 *priv = pci_get_drvdata(pcidev); struct uart_8250_port *port = serial8250_get_port(priv->line[0]); - struct platform_device *pdev = port->port.private_data; + struct platform_device *pdev; + + pdev = port->port.private_data; + if (!pdev) + return; device_remove_software_node(&pdev->dev); platform_device_unregister(pdev); |