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Mark Langsdorf 1cfd895643 ACPI: custom_method: fix a possible memory leak 
In cm_write(), if the 'buf' is allocated memory but not fully consumed,
it is possible to reallocate the buffer without freeing it by passing
'*ppos' as 0 on a subsequent call.

Add an explicit kfree() before kzalloc() to prevent the possible memory
leak.

Fixes: 526b4af47f44 ("ACPI: Split out custom_method functionality into an own driver")
Signed-off-by: Mark Langsdorf <mlangsdo@redhat.com>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-04-28 19:17:54 +02:00
..
acpica
ACPICA: ACPI 6.4: add CSI2Bus resource template
2021-04-07 19:09:01 +02:00
apei
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
arm64
ACPI/IORT: Do not blindly trust DMA masks from firmware
2021-01-27 12:26:24 +00:00
dptf
ACPI: DPTF: Support Alder Lake
2020-11-10 18:52:51 +01:00
nfit
ACPICA: ACPI 6.4: NFIT: add Location Cookie field
2021-04-07 19:09:00 +02:00
numa
ACPI: fix various typos in comments
2021-03-19 17:45:49 +01:00
pmic
ACPI: fix various typos in comments
2021-03-19 17:45:49 +01:00
x86
ACPI: PM: s2idle: Drop unused local variables and related code
2021-01-07 17:41:28 +01:00
ac.c
ACPI: AC: fix some coding style issues
2021-04-08 16:17:32 +02:00
acpi_adxl.c
ACPI/ADXL: Add address translation interface using an ACPI DSM
2018-10-16 10:03:00 +02:00
acpi_amba.c
Merge 5.2-rc6 into char-misc-next
2019-06-23 09:23:33 +02:00
acpi_apd.c
ACPI: APD: fix a block comment align issue
2021-04-08 16:27:02 +02:00
acpi_cmos_rtc.c
ACPI: cmos_rtc: Remove leftover ACPI_MODULE_NAME()
2020-09-25 18:25:51 +02:00
acpi_configfs.c
ACPI: configfs: add missing check after configfs_register_default_group()
2021-01-22 16:35:34 +01:00
acpi_dbg.c
ACPI: debug: Remove the not used function
2020-11-17 18:12:34 +01:00
acpi_extlog.c
ACPI / extlog: Check for RDMSR failure
2020-10-02 19:01:55 +02:00
acpi_fpdt.c
ACPI: tables: introduce support for FPDT table
2021-01-29 19:24:13 +01:00
acpi_ipmi.c
ACPI: ipmi: remove useless return statement for void function
2021-04-08 16:27:02 +02:00
acpi_lpat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
acpi_lpit.c
ACPI: LPIT: Put the low power idle table after using it
2020-05-09 11:29:16 +02:00
acpi_lpss.c
ACPI: LPSS: add a missed blank line after declarations
2021-04-08 16:27:02 +02:00
acpi_memhotplug.c
mm/memory_hotplug: prepare passing flags to add_memory() and friends
2020-10-16 11:11:18 -07:00
acpi_pad.c
ACPI: acpi_pad: add a missed blank line after declarations
2021-04-08 16:27:02 +02:00
acpi_platform.c
ACPI: platform: Remove ACPI_MODULE_NAME()
2020-09-25 18:25:51 +02:00
acpi_pnp.c
ACPI: PNP: compare the string length in the matching_id()
2020-12-15 19:30:49 +01:00
acpi_processor.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
acpi_tad.c
ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros
2021-01-22 16:17:19 +01:00
acpi_video.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
acpi_watchdog.c
ACPI: watchdog: Replace open coded variant of resource_union()
2020-11-17 18:06:29 +01:00
battery.c
ACPI: battery: fix some coding style issues
2021-04-08 16:27:02 +02:00
bgrt.c
ACPI: Use DEVICE_ATTR_<RW|RO|WO> macros
2021-01-22 16:17:19 +01:00
blacklist.c
ACPI: blacklist: fix clang warning for unused DMI table
2019-07-11 22:45:00 +02:00
bus.c
ACPI updates for 5.12-rc1
2021-02-20 21:50:59 -08:00
button.c
ACPI: button: fix some coding style issues
2021-04-08 16:27:02 +02:00
container.c
ACPI: container: Remove leftover ACPICA debug functionality
2020-09-25 18:25:51 +02:00
cppc_acpi.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
custom_method.c
ACPI: custom_method: fix a possible memory leak
2021-04-28 19:17:54 +02:00
debugfs.c
ACPI: debugfs: Remove dead ACPICA debug code
2020-09-25 18:25:51 +02:00
device_pm.c
ACPI: PM: add a missed blank line after declarations
2021-04-08 16:27:02 +02:00
device_sysfs.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
dock.c
ACPI: dock: fix some coding style issues
2021-04-08 16:27:03 +02:00
ec_sys.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
ec.c
ACPI: EC: Clean up status flags checks in advance_transaction()
2020-11-23 20:01:01 +01:00
event.c
ACPI: Fix whitespace inconsistencies
2020-11-09 19:08:06 +01:00
evged.c
ACPI: GED: fix -Wformat
2020-11-09 19:25:20 +01:00
fan.c
ACPI: fan: Initialize performance state sysfs attribute
2020-11-16 15:18:38 +01:00
glue.c
ACPI: bus: Introduce acpi_dev_get() and reuse it in ACPI code
2021-04-13 15:41:11 +02:00
hed.c
ACPI: HED: Drop unused ACPI_MODULE_NAME() definition
2021-03-08 16:51:48 +01:00
internal.h
Merge branches 'acpi-scan', 'acpi-drivers', 'acpi-pm' and 'acpi-resources'
2021-04-26 17:03:46 +02:00
ioapic.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
irq.c
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-07-08 11:01:13 -07:00
Kconfig
Merge branch 'acpi-tables'
2021-02-25 18:57:40 +01:00
Makefile
Merge branch 'acpi-tables'
2021-02-25 18:57:40 +01:00
nvs.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
osi.c
ACPI: OSI: Shoot duplicate word
2019-11-13 11:12:08 +01:00
osl.c
ACPI: OSL: Clean up printing messages
2021-02-10 19:09:43 +01:00
pci_irq.c
ACPI: PCI: IRQ: Consolidate printing diagnostic messages
2021-03-08 16:51:08 +01:00
pci_link.c
ACPI: utils: Introduce acpi_evaluation_failure_warn()
2021-03-08 19:10:30 +01:00
pci_mcfg.c
ACPI: Fix whitespace inconsistencies
2020-11-09 19:08:06 +01:00
pci_root.c
PCI/ACPI: Clarify message about _OSC failure
2021-01-27 09:38:36 -06:00
pci_slot.c
ACPI: PCI: Remove unused ACPICA debug code
2020-09-25 18:25:51 +02:00
platform_profile.c
ACPI: platform: Add balanced-performance platform profile
2021-02-24 14:52:41 +01:00
power.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
pptt.c
ACPI: PPTT: Consistently use unsigned int as parameter type
2020-01-07 11:46:36 +01:00
proc.c
ACPI: proc: Remove dead ACPICA debug code
2020-09-25 18:25:51 +02:00
processor_core.c
ACPI: processor: Remove dead ACPICA debug code
2020-09-25 18:25:51 +02:00
processor_driver.c
ACPI: processor: Get rid of ACPICA message printing
2021-03-08 16:51:19 +01:00
processor_idle.c
Merge branches 'acpi-pci' and 'acpi-processor'
2021-04-26 17:03:05 +02:00
processor_pdc.c
ACPI: processor: Get rid of ACPICA message printing
2021-03-08 16:51:19 +01:00
processor_perflib.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
processor_thermal.c
ACPI: processor: Remove the duplicated ACPI_PROCESSOR_CLASS macro
2020-11-17 18:12:34 +01:00
processor_throttling.c
ACPI: utils: Introduce acpi_evaluation_failure_warn()
2021-03-08 19:10:30 +01:00
property.c
ACPI: property: Satisfy kernel doc validator (part 2)
2021-02-12 15:34:14 +01:00
reboot.c
ACPI: reboot: Avoid racing after writing to ACPI RESET_REG
2020-10-16 18:04:52 +02:00
resource.c
ACPI: fix various typos in comments
2021-03-19 17:45:49 +01:00
sbs.c
ACPI: SBS: Simplify the code using module_acpi_driver()
2020-11-17 18:12:34 +01:00
sbshc.c
ACPI: Fix whitespace inconsistencies
2020-11-09 19:08:06 +01:00
sbshc.h
ACPI: Fix whitespace inconsistencies
2020-11-09 19:08:06 +01:00
scan.c
Merge branch 'acpi-misc'
2021-04-26 17:04:41 +02:00
sleep.c
ACPI: PM: s2idle: Move x86-specific code to the x86 directory
2020-12-17 20:30:02 +01:00
sleep.h
ACPI: scan: Turn off unused power resources during initialization
2021-03-23 18:59:32 +01:00
spcr.c
ACPI: Use fallthrough pseudo-keyword
2020-07-09 14:09:28 +02:00
sysfs.c
Merge branches 'acpi-pci' and 'acpi-processor'
2021-04-26 17:03:05 +02:00
tables.c
ACPI: tables: x86: Reserve memory occupied by ACPI tables
2021-03-29 19:26:04 +02:00
thermal.c
- Use the newly introduced 'hot' and 'critical' ops for the acpi
2021-02-22 09:39:11 -08:00
tiny-power-button.c
ACPI: tiny-power-button: Simplify the code using module_acpi_driver()
2020-11-17 18:12:34 +01:00
utils.c
Merge branches 'acpi-cppc', 'acpi-video' and 'acpi-utils'
2021-04-26 17:04:27 +02:00
video_detect.c
ACPI: video: use native backlight for GA401/GA502/GA503
2021-04-21 18:54:41 +02:00
wakeup.c
ACPI: Fix whitespace inconsistencies
2020-11-09 19:08:06 +01:00