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TTY fixes for 5.6-rc7

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Here are 3 small tty_io bugfixes for reported issues that Eric has
 resolved for 5.6-rc7
 
 All of these have been in linux-next with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-5.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty fixes from Greg KH:
 "Here are three small tty_io bugfixes for reported issues that Eric has
  resolved for 5.6-rc7

  All of these have been in linux-next with no reported issues"

* tag 'tty-5.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: fix compat TIOCGSERIAL checking wrong function ptr
  tty: fix compat TIOCGSERIAL leaking uninitialized memory
  tty: drop outdated comments about release_tty() locking
This commit is contained in:
Linus Torvalds 2020-03-20 09:13:35 -07:00
commit fa91418b72
1 changed files with 6 additions and 8 deletions
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14
drivers/tty/tty_io.c
View File

@ -1589,9 +1589,7 @@ void tty_kclose(struct tty_struct *tty)
tty_debug_hangup(tty, "freeing structure\n");
/*
* The release_tty function takes care of the details of clearing
* the slots and preserving the termios structure. The tty_unlock_pair
* should be safe as we keep a kref while the tty is locked (so the
* unlock never unlocks a freed tty).
* the slots and preserving the termios structure.
*/
mutex_lock(&tty_mutex);
tty_port_set_kopened(tty->port, 0);
@ -1621,9 +1619,7 @@ void tty_release_struct(struct tty_struct *tty, int idx)
tty_debug_hangup(tty, "freeing structure\n");
/*
* The release_tty function takes care of the details of clearing
* the slots and preserving the termios structure. The tty_unlock_pair
* should be safe as we keep a kref while the tty is locked (so the
* unlock never unlocks a freed tty).
* the slots and preserving the termios structure.
*/
mutex_lock(&tty_mutex);
release_tty(tty, idx);
@ -2734,9 +2730,11 @@ static int compat_tty_tiocgserial(struct tty_struct *tty,
struct serial_struct32 v32;
struct serial_struct v;
int err;
memset(&v, 0, sizeof(struct serial_struct));
if (!tty->ops->set_serial)
memset(&v, 0, sizeof(v));
memset(&v32, 0, sizeof(v32));
if (!tty->ops->get_serial)
return -ENOTTY;
err = tty->ops->get_serial(tty, &v);
if (!err) {