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[PATCH] hvc_console: Add some sanity checks

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Check if a vterm was registered before accepting it as a console.
Check that a slot hasn't been probed with a tty in hvc_instantiate().
Check that a slot hasn't been free'ed when handing out console device.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Milton Miller 2005-07-07 17:56:23 -07:00 committed by Linus Torvalds
parent 64e4da5796
commit 7805b1b29f
1 changed files with 18 additions and 0 deletions
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18
drivers/char/hvc_console.c
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@ -192,12 +192,21 @@ void hvc_console_print(struct console *co, const char *b, unsigned count)
static struct tty_driver *hvc_console_device(struct console *c, int *index)
{
if (vtermnos[c->index] == -1)
return NULL;
*index = c->index;
return hvc_driver;
}
static int __init hvc_console_setup(struct console *co, char *options)
{
if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
return -ENODEV;
if (vtermnos[co->index] == -1)
return -ENODEV;
return 0;
}
@ -227,12 +236,21 @@ console_initcall(hvc_console_init);
*/
int hvc_instantiate(uint32_t vtermno, int index)
{
struct hvc_struct *hp;
if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
return -1;
if (vtermnos[index] != -1)
return -1;
/* make sure no no tty has been registerd in this index */
hp = hvc_get_by_index(index);
if (hp) {
kobject_put(&hp->kobj);
return -1;
}
vtermnos[index] = vtermno;
/* reserve all indices upto and including this index */