CVE-2022-49976

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> platform/x86: x86-android-tablets: Fix broken touchscreen on Chuwi Hi8 with Windows BIOS<br /> <br /> The x86-android-tablets handling for the Chuwi Hi8 is only necessary with<br /> the Android BIOS and it is causing problems with the Windows BIOS version.<br /> <br /> Specifically when trying to register the already present touchscreen<br /> x86_acpi_irq_helper_get() calls acpi_unregister_gsi(), this breaks<br /> the working of the touchscreen and also leads to an oops:<br /> <br /> [ 14.248946] ------------[ cut here ]------------<br /> [ 14.248954] remove_proc_entry: removing non-empty directory &amp;#39;irq/75&amp;#39;, leaking at least &amp;#39;MSSL0001:00&amp;#39;<br /> [ 14.248983] WARNING: CPU: 3 PID: 440 at fs/proc/generic.c:718 remove_proc_entry<br /> ...<br /> [ 14.249293] unregister_irq_proc+0xe0/0x100<br /> [ 14.249305] free_desc+0x29/0x70<br /> [ 14.249312] irq_free_descs+0x4b/0x80<br /> [ 14.249320] mp_unmap_irq+0x5c/0x60<br /> [ 14.249329] acpi_unregister_gsi_ioapic+0x2a/0x40<br /> [ 14.249338] x86_acpi_irq_helper_get+0x4b/0x190 [x86_android_tablets]<br /> [ 14.249355] x86_android_tablet_init+0x178/0xe34 [x86_android_tablets]<br /> <br /> Add an init callback for the Chuwi Hi8, which detects when the Windows BIOS<br /> is in use and exits with -ENODEV in that case, fixing this.