On Tue, Jan 08, 2019 at 08:37:37AM -0500, Kyungtae Kim wrote: > We report a bug in linux-4.20: "general protection fault in > spk_ttyio_ldisc_close" > > kernel config: https://kt0755.github.io/etc/config_v4.20_stable > repro: https://kt0755.github.io/etc/repro.a670e.c > > This occurs when the function kfree is about to execute > (driver/staging/speakup/spk_ttyio.c:68). > Particularly, kfree takes the argument like speakup_tty->disc_data. > But speakup_tty is invalid, so the pointer dereference causes GPF. > At a glance, it seems that speakup_tty was deallocated somewhere ahead of kfree. How did you trigger this? Did you shut down and close the device already somehow? Do you have a real tty device that is driven by the device? thanks, greg k-h _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
