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Input: serio HIL MLC - don't deref null, don't leak and return proper error 

While reviewing various users of kernel memory allocation functions I came
across drivers/input/serio/hil_mlc.c::hil_mlc_register() and noticed that:

 - it calls kzalloc() but fails to check for a NULL return before use.
 - it makes several allocations and if one fails it doesn't free the
   previous ones.
 - It doesn't return -ENOMEM in the failed memory allocation case (it just
   crashes).

This patch corrects all of the above and also reworks the only caller of
this function that I could find
(drivers/input/serio/hp_sdc_mlc.c::hp_sdc_mlc_out()) so that it now checks
the return value of hil_mlc_register() and properly propagates it on
failure and I also restructured the code to remove some labels and goto's
to make it, IMHO nicer to read.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Tested-by: Helge Deller <deller@gmx.de>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Jesper Juhl 2010-11-20 13:36:49 -08:00 committed by Dmitry Torokhov
parent bc95df78c4
commit 39de52104d
2 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/input/serio/hil_mlc.c
View File

@ -932,6 +932,11 @@ int hil_mlc_register(hil_mlc *mlc)
hil_mlc_copy_di_scratch(mlc, i);
mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
mlc->serio[i] = mlc_serio;
if (!mlc->serio[i]) {
for (; i >= 0; i--)
kfree(mlc->serio[i]);
return -ENOMEM;
}
snprintf(mlc_serio->name, sizeof(mlc_serio->name)-1, "HIL_SERIO%d", i);
snprintf(mlc_serio->phys, sizeof(mlc_serio->phys)-1, "HIL%d", i);
mlc_serio->id = hil_mlc_serio_id;

18
drivers/input/serio/hp_sdc_mlc.c
View File

@ -305,6 +305,7 @@ static void hp_sdc_mlc_out(hil_mlc *mlc)
static int __init hp_sdc_mlc_init(void)
{
hil_mlc *mlc = &hp_sdc_mlc;
int err;
#ifdef __mc68000__
if (!MACH_IS_HP300)
@ -323,22 +324,21 @@ static int __init hp_sdc_mlc_init(void)
mlc->out = &hp_sdc_mlc_out;
mlc->priv = &hp_sdc_mlc_priv;
if (hil_mlc_register(mlc)) {
err = hil_mlc_register(mlc);
if (err) {
printk(KERN_WARNING PREFIX "Failed to register MLC structure with hil_mlc\n");
goto err0;
return err;
}
if (hp_sdc_request_hil_irq(&hp_sdc_mlc_isr)) {
printk(KERN_WARNING PREFIX "Request for raw HIL ISR hook denied\n");
goto err1;
if (hil_mlc_unregister(mlc))
printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
"This is bad. Could cause an oops.\n");
return -EBUSY;
}
return 0;
err1:
if (hil_mlc_unregister(mlc))
printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
"This is bad. Could cause an oops.\n");
err0:
return -EBUSY;
}
static void __exit hp_sdc_mlc_exit(void)