From 2665bef49f96df1a541b4e71e7b27bf631f7667c Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Tue, 18 Aug 2020 10:56:56 +0200 Subject: [PATCH] vc_screen: sanitize types in vcs_write * ret can carry error codes, so make it signed, i.e. ssize_t * pos is derived from the passed ppos, so make it long enough, i.e. loff_t * attr is a boolean, so... * size is limited by vcs_size() which returns an int * written, p, orig_count and this_round are always ">= 0" and "< size", so uint is enough * col and max_col are derived from vc->vc_cols (uint) and p, so make them uint too * place con_buf0 and con_buf declaration to a single line Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20200818085706.12163-6-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vc_screen.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c index 8aa0d50..2571d90 100644 --- a/drivers/tty/vt/vc_screen.c +++ b/drivers/tty/vt/vc_screen.c @@ -459,14 +459,13 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct inode *inode = file_inode(file); struct vc_data *vc; - long pos; - long attr, size, written; - char *con_buf0; - int col, maxcol; + char *con_buf0, *con_buf; u16 *org0 = NULL, *org = NULL; - size_t ret; - char *con_buf; - bool viewed; + unsigned int written, col, maxcol; + int size; + ssize_t ret; + loff_t pos; + bool viewed, attr; if (use_unicode(inode)) return -EOPNOTSUPP; @@ -500,9 +499,7 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) count = size - pos; written = 0; while (count) { - long this_round = count; - size_t orig_count; - long p; + unsigned int orig_count, p, this_round = count; if (this_round > CON_BUF_SIZE) this_round = CON_BUF_SIZE; -- 2.7.4