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vt_kdsetmode: extend console locking

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As per the long-suffering comment.

Reported-by: Minh Yuan <yuanmingbuaa@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2021-08-30 08:55:18 -07:00
parent 3a2b2eb556
commit 2287a51ba8
1 changed files with 6 additions and 4 deletions
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10
drivers/tty/vt/vt_ioctl.c
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@ -246,6 +246,8 @@ int vt_waitactive(int n)
*
* XXX It should at least call into the driver, fbdev's definitely need to
* restore their engine state. --BenH
*
* Called with the console lock held.
*/
static int vt_kdsetmode(struct vc_data *vc, unsigned long mode)
{
@ -262,7 +264,6 @@ static int vt_kdsetmode(struct vc_data *vc, unsigned long mode)
return -EINVAL;
}
/* FIXME: this needs the console lock extending */
if (vc->vc_mode == mode)
return 0;
@ -271,12 +272,10 @@ static int vt_kdsetmode(struct vc_data *vc, unsigned long mode)
return 0;
/* explicitly blank/unblank the screen if switching modes */
console_lock();
if (mode == KD_TEXT)
do_unblank_screen(1);
else
do_blank_screen(1);
console_unlock();
return 0;
}
@ -378,7 +377,10 @@ static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
if (!perm)
return -EPERM;
return vt_kdsetmode(vc, arg);
console_lock();
ret = vt_kdsetmode(vc, arg);
console_unlock();
return ret;
case KDGETMODE:
return put_user(vc->vc_mode, (int __user *)arg);