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Oliver O'Halloran a0424ef490 cpufreq: powernv: Fix use-after-free 
commit d0a72efac89d1c35ac55197895201b7b94c5e6ef upstream.

The cpufreq driver has a use-after-free that we can hit if:

a) There's an OCC message pending when the notifier is registered, and
b) The cpufreq driver fails to register with the core.

When a) occurs the notifier schedules a workqueue item to handle the
message. The backing work_struct is located on chips[].throttle and
when b) happens we clean up by freeing the array. Once we get to
the (now free) queued item and the kernel crashes.

Fixes: c5e29ea7ac14 ("cpufreq: powernv: Fix bugs in powernv_cpufreq_{init/exit}")
Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200206062622.28235-1-oohall@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:26:16 +08:00
Documentation ALSA: hda/realtek - Remove now-unnecessary XPS 13 headphone noise fixups 2021-03-16 16:26:01 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch s390/diag: fix display of diagnose call statistics 2021-03-16 16:26:15 +08:00
block block, bfq: fix use-after-free in bfq_idle_slice_timer_body 2021-03-16 16:25:59 +08:00
certs Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto crypto: rng - Fix a refcounting bug in crypto_rng_reset() 2021-03-16 16:26:09 +08:00
drivers cpufreq: powernv: Fix use-after-free 2021-03-16 16:26:16 +08:00
fs ocfs2: no need try to truncate file beyond i_size 2021-03-16 16:26:15 +08:00
include xarray: Fix early termination of xas_for_each_marked 2021-03-16 16:26:11 +08:00
init Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ipc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
kernel kmod: make request_module() return an error when autoloading is disabled 2021-03-16 16:26:15 +08:00
lib xarray: Fix early termination of xas_for_each_marked 2021-03-16 16:26:11 +08:00
mm mm, memcg: do not high throttle allocators based on wraparound 2021-03-16 16:26:10 +08:00
net cfg80211: Do not warn on same channel at the end of CSA 2021-03-16 16:25:54 +08:00
package config/arm64: OPEN CONFIG_PSI and phytium configs 2021-03-16 11:02:59 +08:00
samples Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
scripts Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
security KEYS: reaching the keys quotas correctly 2021-03-16 16:26:04 +08:00
sound ALSA: hda/realtek - Add quirk for MSI GL63 2021-03-16 16:26:01 +08:00
tools perf tools: Support Python 3.8+ in Makefile 2021-03-16 16:26:15 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
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README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0