[kernel] Don't dereference sp->tty in serial_bh for nonexistent serial ports

ghaerr · ghaerr · commit a9dc14b11d17 · 2026-04-26T12:11:18.000-06:00
diff --git a/elks/arch/i86/drivers/char/serial-8250.c b/elks/arch/i86/drivers/char/serial-8250.c
@@ -294,7 +294,7 @@ void serial_bh(void)
     struct serial_info *sp;
 
     for (sp = ports; sp < &ports[NR_SERIAL]; sp++) {
-        if (sp->tty->usecount)
+        if (sp->tty && sp->tty->usecount)
             pump_port(sp);
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -294,7 +294,7 @@ void serial_bh(void)`
`294`	`294`	`struct serial_info *sp;`
`295`	`295`
`296`	`296`	`for (sp = ports; sp < &ports[NR_SERIAL]; sp++) {`
`297`		`- if (sp->tty->usecount)`
	`297`	`+ if (sp->tty && sp->tty->usecount)`
`298`	`298`	`pump_port(sp);`
`299`	`299`	`}`
`300`	`300`	`}`