this one didn't apply on top of the other two?
On Tue, 3 Jun 2008, Henrique de Moraes Holschuh wrote:
> The less tested codepaths for LED handling, used on ThinkPads 570, 600e/x,
> 770e, 770x, A21e, A2xm/p, T20-22, X20 and maybe a few others, would write
> data to kernel memory it had no business touching, for leds number 3 and
> above. If one is lucky, that illegal write would cause an OOPS, but
> chances are it would silently corrupt a byte.
>
> The problem was introduced in commit af116101, "ACPI: thinkpad-acpi: add
> sysfs led class support to thinkpad leds (v3.2)".
>
> Fix the bug by refactoring the entire code to be far more obvious on what
> it wants to do. Also do some defensive "constification".
>
> Issue reported by Karol Lewandowski <lmctlx@xxxxxxxxx> (he's an lucky guy
> and got an OOPS instead of silent corruption :-) ).
>
> Root cause of the OOPS identified by Adrian Bunk <bunk@xxxxxxxxxx>.
> Thanks, Adrian!
>
> Signed-off-by: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
> Tested-by: Karol Lewandowski <lmctlx@xxxxxxxxx>
> Cc: Adrian Bunk <bunk@xxxxxxxxxx>
> ---
> drivers/misc/thinkpad_acpi.c | 55 +++++++++++++++++++++--------------------
> 1 files changed, 28 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
> index 58973da..b596929 100644
> --- a/drivers/misc/thinkpad_acpi.c
> +++ b/drivers/misc/thinkpad_acpi.c
> @@ -3853,7 +3853,7 @@ static const char * const tpacpi_led_names[TPACPI_LED_NUMLEDS] = {
> "tpacpi::standby",
> };
>
> -static int led_get_status(unsigned int led)
> +static int led_get_status(const unsigned int led)
> {
> int status;
> enum led_status_t led_s;
> @@ -3877,41 +3877,42 @@ static int led_get_status(unsigned int led)
> /* not reached */
> }
>
> -static int led_set_status(unsigned int led, enum led_status_t ledstatus)
> +static int led_set_status(const unsigned int led,
> + const enum led_status_t ledstatus)
> {
> /* off, on, blink. Index is led_status_t */
> - static const int led_sled_arg1[] = { 0, 1, 3 };
> - static const int led_exp_hlbl[] = { 0, 0, 1 }; /* led# * */
> - static const int led_exp_hlcl[] = { 0, 1, 1 }; /* led# * */
> - static const int led_led_arg1[] = { 0, 0x80, 0xc0 };
> + static const unsigned int led_sled_arg1[] = { 0, 1, 3 };
> + static const unsigned int led_led_arg1[] = { 0, 0x80, 0xc0 };
>
> int rc = 0;
>
> switch (led_supported) {
> case TPACPI_LED_570:
> - /* 570 */
> - led = 1 << led;
> - if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
> - led, led_sled_arg1[ledstatus]))
> - rc = -EIO;
> - break;
> + /* 570 */
> + if (led > 7)
> + return -EINVAL;
> + if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
> + (1 << led), led_sled_arg1[ledstatus]))
> + rc = -EIO;
> + break;
> case TPACPI_LED_OLD:
> - /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
> - led = 1 << led;
> - rc = ec_write(TPACPI_LED_EC_HLMS, led);
> - if (rc >= 0)
> - rc = ec_write(TPACPI_LED_EC_HLBL,
> - led * led_exp_hlbl[ledstatus]);
> - if (rc >= 0)
> - rc = ec_write(TPACPI_LED_EC_HLCL,
> - led * led_exp_hlcl[ledstatus]);
> - break;
> + /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20 */
> + if (led > 7)
> + return -EINVAL;
> + rc = ec_write(TPACPI_LED_EC_HLMS, (1 << led));
> + if (rc >= 0)
> + rc = ec_write(TPACPI_LED_EC_HLBL,
> + (ledstatus == TPACPI_LED_BLINK) << led);
> + if (rc >= 0)
> + rc = ec_write(TPACPI_LED_EC_HLCL,
> + (ledstatus != TPACPI_LED_OFF) << led);
> + break;
> case TPACPI_LED_NEW:
> - /* all others */
> - if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
> - led, led_led_arg1[ledstatus]))
> - rc = -EIO;
> - break;
> + /* all others */
> + if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
> + led, led_led_arg1[ledstatus]))
> + rc = -EIO;
> + break;
> default:
> rc = -ENXIO;
> }
> --
> 1.5.5.3
>
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