platform/x86: x86-android-tablets: Fix use after free on platform_device_register...

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: 5eba0141206e ("platform/x86: x86-android-tablets: Add support for instantiating platform-devs")
Fixes: e2200d3f26da ("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

diff --git a/drivers/platform/x86/x86-android-tablets/core.c b/drivers/platform/x86/x86-android-tablets/core.c
index 1427a9a3900855a822cded14c87af2dc46a6c467..ef572b90e06ba4012f5eecfc7a7e857c5937abea 100644 (file)
--- a/drivers/platform/x86/x86-android-tablets/core.c
+++ b/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++;
        }