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SubjectRe: Crash when specifying non-existent serial port in speakup / tty_kopen
Matthias Reichl, le mer. 04 nov. 2020 22:15:05 +0100, a ecrit:
> > This looks like only a warning, did it actually crash?
>
> Yes, scroll down a bit, the null pointer oops followed almost
> immediately after that
>
> [ 49.979043] BUG: kernel NULL pointer dereference, address: 0000000000000090

Ah, [ 50.102938] tty_init_dev+0xb5/0x1d0

probably the trailing release_tty call that does

tty->port->itty = NULL;
(itty is after a struct tty_bufhead + the tty pointer, that looks
plausible).

so probably an if (tty->port) in release_tty could help?

Samuel

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