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Michael Ellerman e37a469827 drivers/macintosh: Fix memleak in windfarm_pm112 driver 
commit 93900337b9ac2f4eca427eff6d187be2dc3b5551 upstream.

create_cpu_loop() calls smu_sat_get_sdb_partition() which does
kmalloc() and returns the allocated buffer. In fact it's called twice,
and neither buffer is freed.

This results in a memory leak as reported by Erhard:
  unreferenced object 0xc00000047081f840 (size 32):
    comm "kwindfarm", pid 203, jiffies 4294880630 (age 5552.877s)
    hex dump (first 32 bytes):
      c8 06 02 7f ff 02 ff 01 fb bf 00 41 00 20 00 00  ...........A. ..
      00 07 89 37 00 a0 00 00 00 00 00 00 00 00 00 00  ...7............
    backtrace:
      [<0000000083f0a65c>] .smu_sat_get_sdb_partition+0xc4/0x2d0 [windfarm_smu_sat]
      [<000000003010fcb7>] .pm112_wf_notify+0x104c/0x13bc [windfarm_pm112]
      [<00000000b958b2dd>] .notifier_call_chain+0xa8/0x180
      [<0000000070490868>] .blocking_notifier_call_chain+0x64/0x90
      [<00000000131d8149>] .wf_thread_func+0x114/0x1a0
      [<000000000d54838d>] .kthread+0x13c/0x190
      [<00000000669b72bc>] .ret_from_kernel_thread+0x58/0x64
  unreferenced object 0xc0000004737089f0 (size 16):
    comm "kwindfarm", pid 203, jiffies 4294880879 (age 5552.050s)
    hex dump (first 16 bytes):
      c4 04 01 7f 22 11 e0 e6 ff 55 7b 12 ec 11 00 00  ...."....U{.....
    backtrace:
      [<0000000083f0a65c>] .smu_sat_get_sdb_partition+0xc4/0x2d0 [windfarm_smu_sat]
      [<00000000b94ef7e1>] .pm112_wf_notify+0x1294/0x13bc [windfarm_pm112]
      [<00000000b958b2dd>] .notifier_call_chain+0xa8/0x180
      [<0000000070490868>] .blocking_notifier_call_chain+0x64/0x90
      [<00000000131d8149>] .wf_thread_func+0x114/0x1a0
      [<000000000d54838d>] .kthread+0x13c/0x190
      [<00000000669b72bc>] .ret_from_kernel_thread+0x58/0x64

Fix it by rearranging the logic so we deal with each buffer
separately, which then makes it easy to free the buffer once we're
done with it.

Fixes: ac171c4666 ("[PATCH] powerpc: Thermal control for dual core G5s")
Cc: stable@vger.kernel.org # v2.6.16+
Reported-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Erhard F. <erhard_f@mailbox.org>
Link: https://lore.kernel.org/r/20200423060038.3308530-1-mpe@ellerman.id.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-06-22 09:05:29 +02:00
..
ams macintosh/ams-input: Use true and false for boolean values 2018-01-28 17:21:17 +11:00
adb-iop.c macintosh/adb: Use C99 initializers for struct adb_driver instances 2018-03-31 00:10:32 +11:00
adb.c macintosh/via-pmu: Replace via-pmu68k driver with via-pmu driver 2018-07-31 19:56:42 +10:00
adbhid.c macintosh/adb: Properly mark continued kernel messages 2018-01-27 21:10:22 +11:00
ans-lcd.c macintosh: Add module license to ans-lcd 2018-03-13 15:10:14 +11:00
ans-lcd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
apm_emu.c
Kconfig macintosh/via-pmu: Replace via-pmu68k driver with via-pmu driver 2018-07-31 19:56:42 +10:00
mac_hid.c macintosh: Convert use of typedef ctl_table to struct ctl_table 2013-07-01 11:10:35 +10:00
macio-adb.c macintosh/adb: Use C99 initializers for struct adb_driver instances 2018-03-31 00:10:32 +11:00
macio_asic.c powerpc/macio: set a proper dma_coherent_mask 2018-02-13 08:58:53 -08:00
macio_sysfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile macintosh/via-pmu: Replace via-pmu68k driver with via-pmu driver 2018-07-31 19:56:42 +10:00
mediabay.c
rack-meter.c drivers: macintosh: rack-meter: really fix bogus memsets 2018-03-31 00:10:35 +11:00
smu.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
therm_adt746x.c macintosh: change some data types from int to bool 2018-01-28 17:21:09 +11:00
therm_windtunnel.c macintosh: therm_windtunnel: fix regression when instantiating devices 2020-03-05 16:42:18 +01:00
via-cuda.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
via-macii.c macintosh/adb: Use C99 initializers for struct adb_driver instances 2018-03-31 00:10:32 +11:00
via-pmu-backlight.c backlight: Fix old-style function definition 2018-01-21 23:37:44 +11:00
via-pmu-event.c
via-pmu-event.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
via-pmu-led.c powerpc: use the new LED disk activity trigger 2016-06-27 08:58:40 +02:00
via-pmu.c macintosh/via-pmu: Disambiguate interrupt statistics 2018-07-31 19:56:43 +10:00
windfarm.h windfarm: remove three exported but unused functions 2015-08-06 15:10:21 +10:00
windfarm_ad7417_sensor.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_core.c Make static usermode helper binaries constant 2017-01-19 12:59:45 +01:00
windfarm_cpufreq_clamp.c drivers/macintosh: Make wf_control_ops and wf_pid_param const 2017-08-14 21:57:56 +10:00
windfarm_fcu_controls.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_lm75_sensor.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_lm87_sensor.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_max6690_sensor.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_mpu.h
windfarm_pid.c
windfarm_pid.h
windfarm_pm72.c macintosh: change some data types from int to bool 2018-01-28 17:21:09 +11:00
windfarm_pm81.c macintosh/windfarm: fix spelling mistake: "ttarged" -> "ttarget" 2018-05-14 23:10:33 +10:00
windfarm_pm91.c macintosh/windfarm: fix spelling mistake: "ttarged" -> "ttarget" 2018-05-14 23:10:33 +10:00
windfarm_pm112.c drivers/macintosh: Fix memleak in windfarm_pm112 driver 2020-06-22 09:05:29 +02:00
windfarm_pm121.c macintosh/windfarm: fix spelling mistake: "ttarged" -> "ttarget" 2018-05-14 23:10:33 +10:00
windfarm_rm31.c macintosh: change some data types from int to bool 2018-01-28 17:21:09 +11:00
windfarm_smu_controls.c drivers/macintosh: Make wf_control_ops and wf_pid_param const 2017-08-14 21:57:56 +10:00
windfarm_smu_sat.c macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
windfarm_smu_sensors.c powerpc/macintosh: constify wf_sensor_ops structures 2017-09-01 16:42:54 +10:00