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authorJiri Slaby <jslaby@suse.cz>2021-07-23 09:43:12 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-27 12:17:20 +0200
commit0524513afe45a4a79f418c0377160b7712cab78a (patch)
treeeab43a3f41c183818029805709a1abbf6625ef21 /drivers/tty
parent7ccbdcc4d08a6d7041e4849219bbb12ffa45db4c (diff)
downloadlinux-0524513afe45a4a79f418c0377160b7712cab78a.tar.bz2
tty: don't store semi-state into tty drivers
When a tty driver pointer is used as a return value of struct console's device() hook, don't store a semi-state into global variable which holds the tty driver. It could mean console::device() would return a bogus value. This is important esp. after the next patch where we switch from alloc_tty_driver to tty_alloc_driver. tty_alloc_driver returns ERR_PTR in case of error and that might have unexpected results as the code doesn't expect this. Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com> Cc: Felipe Balbi <balbi@kernel.org> Reviewed-by: Max Filippov <jcmvbkbc@gmail.com> Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210723074317.32690-4-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/amiserial.c35
-rw-r--r--drivers/tty/ehv_bytechan.c28
-rw-r--r--drivers/tty/hvc/hvsi.c35
3 files changed, 54 insertions, 44 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 7ad103e128ac..bfd3acc1ecfa 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1490,34 +1490,35 @@ static const struct tty_port_operations amiga_port_ops = {
static int __init amiga_serial_probe(struct platform_device *pdev)
{
struct serial_state *state = &serial_state;
+ struct tty_driver *driver;
unsigned long flags;
int error;
- serial_driver = alloc_tty_driver(1);
- if (!serial_driver)
+ driver = alloc_tty_driver(1);
+ if (!driver)
return -ENOMEM;
/* Initialize the tty_driver structure */
- serial_driver->driver_name = "amiserial";
- serial_driver->name = "ttyS";
- serial_driver->major = TTY_MAJOR;
- serial_driver->minor_start = 64;
- serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
- serial_driver->subtype = SERIAL_TYPE_NORMAL;
- serial_driver->init_termios = tty_std_termios;
- serial_driver->init_termios.c_cflag =
+ driver->driver_name = "amiserial";
+ driver->name = "ttyS";
+ driver->major = TTY_MAJOR;
+ driver->minor_start = 64;
+ driver->type = TTY_DRIVER_TYPE_SERIAL;
+ driver->subtype = SERIAL_TYPE_NORMAL;
+ driver->init_termios = tty_std_termios;
+ driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver->flags = TTY_DRIVER_REAL_RAW;
- tty_set_operations(serial_driver, &serial_ops);
+ driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(driver, &serial_ops);
memset(state, 0, sizeof(*state));
state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
tty_port_init(&state->tport);
state->tport.ops = &amiga_port_ops;
- tty_port_link_device(&state->tport, serial_driver, 0);
+ tty_port_link_device(&state->tport, driver, 0);
- error = tty_register_driver(serial_driver);
+ error = tty_register_driver(driver);
if (error)
goto fail_put_tty_driver;
@@ -1558,15 +1559,17 @@ static int __init amiga_serial_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, state);
+ serial_driver = driver;
+
return 0;
fail_free_irq:
free_irq(IRQ_AMIGA_TBE, state);
fail_unregister:
- tty_unregister_driver(serial_driver);
+ tty_unregister_driver(driver);
fail_put_tty_driver:
tty_port_destroy(&state->tport);
- put_tty_driver(serial_driver);
+ put_tty_driver(driver);
return error;
}
diff --git a/drivers/tty/ehv_bytechan.c b/drivers/tty/ehv_bytechan.c
index 445e5ff9b36d..97ae940af478 100644
--- a/drivers/tty/ehv_bytechan.c
+++ b/drivers/tty/ehv_bytechan.c
@@ -751,6 +751,7 @@ static struct platform_driver ehv_bc_tty_driver = {
*/
static int __init ehv_bc_init(void)
{
+ struct tty_driver *driver;
struct device_node *np;
unsigned int count = 0; /* Number of elements in bcs[] */
int ret;
@@ -773,26 +774,28 @@ static int __init ehv_bc_init(void)
if (!bcs)
return -ENOMEM;
- ehv_bc_driver = alloc_tty_driver(count);
- if (!ehv_bc_driver) {
+ driver = alloc_tty_driver(count);
+ if (!driver) {
ret = -ENOMEM;
goto err_free_bcs;
}
- ehv_bc_driver->driver_name = "ehv-bc";
- ehv_bc_driver->name = ehv_bc_console.name;
- ehv_bc_driver->type = TTY_DRIVER_TYPE_CONSOLE;
- ehv_bc_driver->subtype = SYSTEM_TYPE_CONSOLE;
- ehv_bc_driver->init_termios = tty_std_termios;
- ehv_bc_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
- tty_set_operations(ehv_bc_driver, &ehv_bc_ops);
+ driver->driver_name = "ehv-bc";
+ driver->name = ehv_bc_console.name;
+ driver->type = TTY_DRIVER_TYPE_CONSOLE;
+ driver->subtype = SYSTEM_TYPE_CONSOLE;
+ driver->init_termios = tty_std_termios;
+ driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ tty_set_operations(driver, &ehv_bc_ops);
- ret = tty_register_driver(ehv_bc_driver);
+ ret = tty_register_driver(driver);
if (ret) {
pr_err("ehv-bc: could not register tty driver (ret=%i)\n", ret);
goto err_put_tty_driver;
}
+ ehv_bc_driver = driver;
+
ret = platform_driver_register(&ehv_bc_tty_driver);
if (ret) {
pr_err("ehv-bc: could not register platform driver (ret=%i)\n",
@@ -803,9 +806,10 @@ static int __init ehv_bc_init(void)
return 0;
err_deregister_tty_driver:
- tty_unregister_driver(ehv_bc_driver);
+ ehv_bc_driver = NULL;
+ tty_unregister_driver(driver);
err_put_tty_driver:
- put_tty_driver(ehv_bc_driver);
+ put_tty_driver(driver);
err_free_bcs:
kfree(bcs);
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
index f0bc8e780051..bfde7b1936a5 100644
--- a/drivers/tty/hvc/hvsi.c
+++ b/drivers/tty/hvc/hvsi.c
@@ -1038,29 +1038,30 @@ static const struct tty_operations hvsi_ops = {
static int __init hvsi_init(void)
{
+ struct tty_driver *driver;
int i, ret;
- hvsi_driver = alloc_tty_driver(hvsi_count);
- if (!hvsi_driver)
+ driver = alloc_tty_driver(hvsi_count);
+ if (!driver)
return -ENOMEM;
- hvsi_driver->driver_name = "hvsi";
- hvsi_driver->name = "hvsi";
- hvsi_driver->major = HVSI_MAJOR;
- hvsi_driver->minor_start = HVSI_MINOR;
- hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM;
- hvsi_driver->init_termios = tty_std_termios;
- hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
- hvsi_driver->init_termios.c_ispeed = 9600;
- hvsi_driver->init_termios.c_ospeed = 9600;
- hvsi_driver->flags = TTY_DRIVER_REAL_RAW;
- tty_set_operations(hvsi_driver, &hvsi_ops);
+ driver->driver_name = "hvsi";
+ driver->name = "hvsi";
+ driver->major = HVSI_MAJOR;
+ driver->minor_start = HVSI_MINOR;
+ driver->type = TTY_DRIVER_TYPE_SYSTEM;
+ driver->init_termios = tty_std_termios;
+ driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
+ driver->init_termios.c_ispeed = 9600;
+ driver->init_termios.c_ospeed = 9600;
+ driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(driver, &hvsi_ops);
for (i=0; i < hvsi_count; i++) {
struct hvsi_struct *hp = &hvsi_ports[i];
int ret = 1;
- tty_port_link_device(&hp->port, hvsi_driver, i);
+ tty_port_link_device(&hp->port, driver, i);
ret = request_irq(hp->virq, hvsi_interrupt, 0, "hvsi", hp);
if (ret)
@@ -1069,12 +1070,14 @@ static int __init hvsi_init(void)
}
hvsi_wait = wait_for_state; /* irqs active now */
- ret = tty_register_driver(hvsi_driver);
+ ret = tty_register_driver(driver);
if (ret) {
pr_err("Couldn't register hvsi console driver\n");
goto err_free_irq;
}
+ hvsi_driver = driver;
+
printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count);
return 0;
@@ -1085,7 +1088,7 @@ err_free_irq:
free_irq(hp->virq, hp);
}
- tty_driver_kref_put(hvsi_driver);
+ tty_driver_kref_put(driver);
return ret;
}