]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
serial: 8250_exar: Avoid NULL pointer dereference at ->exit()
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Tue, 8 Jun 2021 14:42:37 +0000 (17:42 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 9 Jun 2021 12:40:48 +0000 (14:40 +0200)
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>
drivers/tty/serial/8250/8250_exar.c

index 2f49c580139b86276952cb31443e17d9eac7e00c..bd4e9f6ac29ce6e1dcd25be85b3d69408b1e5477 100644 (file)
@@ -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);