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| author | Eric Biggers <ebiggers@google.com> | 2020-02-24 00:03:26 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-02 15:11:00 +0200 |
| commit | d1b6ab26c850ff1e02e895b10e74564a4df12483 (patch) | |
| tree | 34a7daac26788acec27fe9cdcd59266a9dbb4796 /drivers/tty/vt/vt_ioctl.c | |
| parent | c897e625f94b3dad181362c98f6eef61ef8471a9 (diff) | |
| download | linux-stable-d1b6ab26c850ff1e02e895b10e74564a4df12483.tar.gz linux-stable-d1b6ab26c850ff1e02e895b10e74564a4df12483.tar.bz2 linux-stable-d1b6ab26c850ff1e02e895b10e74564a4df12483.zip | |
vt: vt_ioctl: remove unnecessary console allocation checks
commit 1aa6e058dd6cd04471b1f21298270014daf48ac9 upstream.
The vc_cons_allocated() checks in vt_ioctl() and vt_compat_ioctl() are
unnecessary because they can only be reached by calling ioctl() on an
open tty, which implies the corresponding virtual console is allocated.
And even if the virtual console *could* be freed concurrently, then
these checks would be broken since they aren't done under console_lock,
and the vc_data is dereferenced before them anyway.
So, remove these unneeded checks to avoid confusion.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20200224080326.295046-1-ebiggers@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt/vt_ioctl.c')
| -rw-r--r-- | drivers/tty/vt/vt_ioctl.c | 16 |
1 files changed, 1 insertions, 15 deletions
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index 38948ac5fc49..7297997fcf04 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -350,22 +350,13 @@ int vt_ioctl(struct tty_struct *tty, { struct vc_data *vc = tty->driver_data; struct console_font_op op; /* used in multiple places here */ - unsigned int console; + unsigned int console = vc->vc_num; unsigned char ucval; unsigned int uival; void __user *up = (void __user *)arg; int i, perm; int ret = 0; - console = vc->vc_num; - - - if (!vc_cons_allocated(console)) { /* impossible? */ - ret = -ENOIOCTLCMD; - goto out; - } - - /* * To have permissions to do most of the vt ioctls, we either have * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. @@ -1195,14 +1186,9 @@ long vt_compat_ioctl(struct tty_struct *tty, { struct vc_data *vc = tty->driver_data; struct console_font_op op; /* used in multiple places here */ - unsigned int console = vc->vc_num; void __user *up = compat_ptr(arg); int perm; - - if (!vc_cons_allocated(console)) /* impossible? */ - return -ENOIOCTLCMD; - /* * To have permissions to do most of the vt ioctls, we either have * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |