platform/x86: x86-android-tablets: Fix use after free on platform_dev…

…ice_register() errors

commit 2fae312 upstream.

x86_android_tablet_remove() frees the pdevs[] array, so it should not
be used after calling x86_android_tablet_remove().

When platform_device_register() fails, store the pdevs[x] PTR_ERR() value
into the local ret variable before calling x86_android_tablet_remove()
to avoid using pdevs[] after it has been freed.

Fixes: 5eba014 ("platform/x86: x86-android-tablets: Add support for instantiating platform-devs")
Fixes: e2200d3 ("platform/x86: x86-android-tablets: Add gpio_keys support to x86_android_tablet_init()")
Cc: stable@vger.kernel.org
Reported-by: Aleksandr Burakov <a.burakov@rosalinux.ru>
Closes: https://lore.kernel.org/platform-driver-x86/20240917120458.7300-1-a.burakov@rosalinux.ru/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20241005130545.64136-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/platform/x86/x86-android-tablets/core.c

@@ -390,8 +390,9 @@ static __init int x86_android_tablet_probe(struct platform_device *pdev)
  for (i = 0; i < pdev_count; i++) {
  pdevs[i] = platform_device_register_full(&dev_info->pdev_info[i]);
  if (IS_ERR(pdevs[i])) {
+ ret = PTR_ERR(pdevs[i]);
  x86_android_tablet_remove(pdev);
- return PTR_ERR(pdevs[i]);
+ return ret;
  }
  }
 
@@ -443,8 +444,9 @@ static __init int x86_android_tablet_probe(struct platform_device *pdev)
  PLATFORM_DEVID_AUTO,
  &pdata, sizeof(pdata));
  if (IS_ERR(pdevs[pdev_count])) {
+ ret = PTR_ERR(pdevs[pdev_count]);
  x86_android_tablet_remove(pdev);
- return PTR_ERR(pdevs[pdev_count]);
+ return ret;
  }
  pdev_count++;
  }