From a32418919dd5e863ce47db1bac9051a5364e44a0 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 23 Jul 2020 17:34:22 -0500 Subject: [PATCH] tty: Use the preferred form for passing the size of a structure type Use the preferred form for passing the size of a structure type. The alternative form where the structure type is spelled out hurts readability and introduces an opportunity for a bug when the object type is changed but the corresponding object identifier to which the sizeof operator is applied is not. Signed-off-by: Gustavo A. R. Silva Acked-by: Jiri Slaby Link: https://lore.kernel.org/r/b04dd8cdd67bd6ffde3fd12940aeef35fdb824a6.1595543280.git.gustavoars@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 629fbafc9b7e..ceed72c9a88f 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1405,7 +1405,7 @@ void tty_save_termios(struct tty_struct *tty) /* Stash the termios data */ tp = tty->driver->termios[idx]; if (tp == NULL) { - tp = kmalloc(sizeof(struct ktermios), GFP_KERNEL); + tp = kmalloc(sizeof(*tp), GFP_KERNEL); if (tp == NULL) return; tty->driver->termios[idx] = tp; @@ -2489,7 +2489,7 @@ static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user * struct serial_struct v; int flags; - if (copy_from_user(&v, ss, sizeof(struct serial_struct))) + if (copy_from_user(&v, ss, sizeof(*ss))) return -EFAULT; flags = v.flags & ASYNC_DEPRECATED; @@ -2507,11 +2507,11 @@ static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user * struct serial_struct v; int err; - memset(&v, 0, sizeof(struct serial_struct)); + memset(&v, 0, sizeof(v)); if (!tty->ops->get_serial) return -ENOTTY; err = tty->ops->get_serial(tty, &v); - if (!err && copy_to_user(ss, &v, sizeof(struct serial_struct))) + if (!err && copy_to_user(ss, &v, sizeof(v))) err = -EFAULT; return err; } @@ -2705,7 +2705,7 @@ static int compat_tty_tiocsserial(struct tty_struct *tty, struct serial_struct v; int flags; - if (copy_from_user(&v32, ss, sizeof(struct serial_struct32))) + if (copy_from_user(&v32, ss, sizeof(*ss))) return -EFAULT; memcpy(&v, &v32, offsetof(struct serial_struct32, iomem_base)); @@ -2743,7 +2743,7 @@ static int compat_tty_tiocgserial(struct tty_struct *tty, 0xfffffff : ptr_to_compat(v.iomem_base); v32.iomem_reg_shift = v.iomem_reg_shift; v32.port_high = v.port_high; - if (copy_to_user(ss, &v32, sizeof(struct serial_struct32))) + if (copy_to_user(ss, &v32, sizeof(v32))) err = -EFAULT; } return err; @@ -3215,7 +3215,7 @@ struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner, if (!lines || (flags & TTY_DRIVER_UNNUMBERED_NODE && lines > 1)) return ERR_PTR(-EINVAL); - driver = kzalloc(sizeof(struct tty_driver), GFP_KERNEL); + driver = kzalloc(sizeof(*driver), GFP_KERNEL); if (!driver) return ERR_PTR(-ENOMEM);