Commit d39b7dd1 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

sgi-gru: decrapfiy options_write() function



Not a single line of actual code in the function was really
fundamentally correct.

Problems ranged from lack of proper range checking, to removing the last
character written (which admittedly is usually '\n'), to not accepting
hex numbers even though the 'show' routine would show the data in that
format.

This tries to do better.
Acked-by: default avatarMichael Buesch <mb@bu3sch.de>
Tested-and-acked-by: default avatarJack Steiner <steiner@sgi.com>
Cc: stable@kernel.org
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Michael Gilbert <michael.s.gilbert@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 91d3f9ba
......@@ -161,14 +161,15 @@ static int options_show(struct seq_file *s, void *p)
static ssize_t options_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *data)
{
unsigned long val;
char buf[80];
char buf[20];
if (strncpy_from_user(buf, userbuf, sizeof(buf) - 1) < 0)
if (count >= sizeof(buf))
return -EINVAL;
if (copy_from_user(buf, userbuf, count))
return -EFAULT;
buf[count - 1] = '\0';
if (!strict_strtoul(buf, 10, &val))
gru_options = val;
buf[count] = '\0';
if (strict_strtoul(buf, 0, &gru_options))
return -EINVAL;
return count;
}
......
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