leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ACPI fixes for 5.14-rc3

Browse Source 
- Fix recently broken Kconfig dependency for the ACPI table
    override via built-in initrd (Robert Richter).
 
  - Fix ACPI device reference counting in the for_each_acpi_dev_match()
    helper macro to avoid use-after-free (Andy Shevchenko).
 -----BEGIN PGP SIGNATURE-----
 
 iQJGBAABCAAwFiEE4fcc61cGeeHD/fCwgsRv/nhiVHEFAmD63a4SHHJqd0Byand5
 c29ja2kubmV0AAoJEILEb/54YlRx1/4P/RX0iDLc0johyYFax+X4elOhTzjv8Yp3
 XAqFrJD7mn102jTqMWClZYRT6+KBDDadwVgLW9m9ElLoWW/+PNeyidm7iZbJvLGd
 ZEubCMktc9hrBg+zhnFRXbaDWfn7GS4BEWuBl79D4DKyOUDTg17ggo3JO7E7yrr3
 FCZMCjJu6vUhXafLjL/tCv1vF7wfbZK21bOdZI10QWX2VFa3qTvHLDPiSqp5inYZ
 OCVq2CaDWD94LcWTetyJbRe2uOrAgH2VPj/6Gieh3u0xZrpDVHxgfgQJ6anKTdNK
 xf4TpsV08Em4NS4j+GOXTJZO535K2yriey95tBkhtJd0JSaiLso9NYy8TsOuNl8j
 1yVxbCMaytpmU3867QFu9wq5lkDxX8vpvQUIWtbHd3+2CrRCyup2+kdSPCM7zwpq
 pDCM8ACU3uhAiD9X2KOmW8oxlAvG7C/LhEPnVzJu0vYLj2YJZAklCDEiKmKbn790
 +0n5rVBUXnCxZWTmmn6Pf995rmQT3WJr6NRWNKIA8Lee3HSso+yrR8N27AgWELeQ
 GhmBeQbzGMmX+cQTHByDXum5FC5Kecyo/PqwsN1z+wvnEVCACKn7GVrOJS0lU191
 DYWvFYBm6VsVAQsxakN5N6CzCW/+49yVNT71CjXTrS9nRAPgHi9wDgidlfjtyyS8
 RUz9OIuF6QOX
 =kiEf
 -----END PGP SIGNATURE-----

Merge tag 'acpi-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix a recently broken Kconfig dependency and ACPI device
  reference counting in an iterator macro.

  Specifics:

   - Fix recently broken Kconfig dependency for the ACPI table override
     via built-in initrd (Robert Richter)

   - Fix ACPI device reference counting in the for_each_acpi_dev_match()
     helper macro to avoid use-after-free (Andy Shevchenko)"

* tag 'acpi-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: utils: Fix reference counting in for_each_acpi_dev_match()
  ACPI: Kconfig: Fix table override from built-in initrd
This commit is contained in:
Linus Torvalds 2021-07-23 11:08:06 -07:00
commit ec6badfbe1
5 changed files with 6 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/acpi/Kconfig
View File

@ -370,7 +370,7 @@ config ACPI_TABLE_UPGRADE
config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
bool "Override ACPI tables from built-in initrd"
depends on ACPI_TABLE_UPGRADE
depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE
help
This option provides functionality to override arbitrary ACPI tables
from built-in uncompressed initrd.

7
drivers/acpi/utils.c
View File

@ -860,11 +860,9 @@ EXPORT_SYMBOL(acpi_dev_present);
* Return the next match of ACPI device if another matching device was present
* at the moment of invocation, or NULL otherwise.
*
* FIXME: The function does not tolerate the sudden disappearance of @adev, e.g.
* in the case of a hotplug event. That said, the caller should ensure that
* this will never happen.
*
* The caller is responsible for invoking acpi_dev_put() on the returned device.
* On the other hand the function invokes acpi_dev_put() on the given @adev
* assuming that its reference counter had been increased beforehand.
*
* See additional information in acpi_dev_present() as well.
*/
@ -880,6 +878,7 @@ acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const cha
match.hrv = hrv;
dev = bus_find_device(&acpi_bus_type, start, &match, acpi_dev_match_cb);
acpi_dev_put(adev);
return dev ? to_acpi_device(dev) : NULL;
}
EXPORT_SYMBOL(acpi_dev_get_next_match_dev);

1
drivers/firmware/efi/dev-path-parser.c
View File

@ -34,7 +34,6 @@ static long __init parse_acpi_path(const struct efi_dev_path *node,
break;
if (!adev->pnp.unique_id && node->acpi.uid == 0)
break;
acpi_dev_put(adev);
}
if (!adev)
return -ENODEV;

6
drivers/media/pci/intel/ipu3/cio2-bridge.c
View File

@ -173,10 +173,8 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
int ret;
for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) {
if (!adev->status.enabled) {
acpi_dev_put(adev);
if (!adev->status.enabled)
continue;
}
if (bridge->n_sensors >= CIO2_NUM_PORTS) {
acpi_dev_put(adev);
@ -185,7 +183,6 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
}
sensor = &bridge->sensors[bridge->n_sensors];
sensor->adev = adev;
strscpy(sensor->name, cfg->hid, sizeof(sensor->name));
ret = cio2_bridge_read_acpi_buffer(adev, "SSDB",
@ -215,6 +212,7 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
goto err_free_swnodes;
}
sensor->adev = acpi_dev_get(adev);
adev->fwnode.secondary = fwnode;
dev_info(&cio2->dev, "Found supported sensor %s\n",

5
include/acpi/acpi_bus.h
View File

@ -707,11 +707,6 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
*
* The caller is responsible for invoking acpi_dev_put() on the returned device.
*
* FIXME: Due to above requirement there is a window that may invalidate @adev
* and next iteration will use a dangling pointer, e.g. in the case of a
* hotplug event. That said, the caller should ensure that this will never
* happen.
*/
#define for_each_acpi_dev_match(adev, hid, uid, hrv) \
for (adev = acpi_dev_get_first_match_dev(hid, uid, hrv); \