https://github.com/torvalds/linux
Revision 6941051d3028963c3b0b3fcdd0815f2b51b957bb authored by Sudeep Holla on 18 October 2019, 10:58:15 UTC, committed by Rafael J. Wysocki on 22 October 2019, 16:07:30 UTC
Scheduled policy update work may end up racing with the freeing of the policy and unregistering the driver. One possible race is as below, where the cpufreq_driver is unregistered, but the scheduled work gets executed at later stage when, cpufreq_driver is NULL (i.e. after freeing the policy and driver). Unable to handle kernel NULL pointer dereference at virtual address 0000001c pgd = (ptrval) [0000001c] *pgd=80000080204003, *pmd=00000000 Internal error: Oops: 206 [#1] SMP THUMB2 Modules linked in: CPU: 0 PID: 34 Comm: kworker/0:1 Not tainted 5.4.0-rc3-00006-g67f5a8081a4b #86 Hardware name: ARM-Versatile Express Workqueue: events handle_update PC is at cpufreq_set_policy+0x58/0x228 LR is at dev_pm_qos_read_value+0x77/0xac Control: 70c5387d Table: 80203000 DAC: fffffffd Process kworker/0:1 (pid: 34, stack limit = 0x(ptrval)) (cpufreq_set_policy) from (refresh_frequency_limits.part.24+0x37/0x48) (refresh_frequency_limits.part.24) from (handle_update+0x2f/0x38) (handle_update) from (process_one_work+0x16d/0x3cc) (process_one_work) from (worker_thread+0xff/0x414) (worker_thread) from (kthread+0xff/0x100) (kthread) from (ret_from_fork+0x11/0x28) Fixes: 67d874c3b2c6 ("cpufreq: Register notifiers with the PM QoS framework") Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [ rjw: Cancel the work before dropping the QoS requests ] Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent 2aac8bd
Tip revision: 6941051d3028963c3b0b3fcdd0815f2b51b957bb authored by Sudeep Holla on 18 October 2019, 10:58:15 UTC
cpufreq: Cancel policy update work scheduled before freeing
cpufreq: Cancel policy update work scheduled before freeing
Tip revision: 6941051
File | Mode | Size |
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9p | ||
adfs | ||
affs | ||
afs | ||
autofs | ||
befs | ||
bfs | ||
btrfs | ||
cachefiles | ||
ceph | ||
cifs | ||
coda | ||
configfs | ||
cramfs | ||
crypto | ||
debugfs | ||
devpts | ||
dlm | ||
ecryptfs | ||
efivarfs | ||
efs | ||
erofs | ||
exportfs | ||
ext2 | ||
ext4 | ||
f2fs | ||
fat | ||
freevxfs | ||
fscache | ||
fuse | ||
gfs2 | ||
hfs | ||
hfsplus | ||
hostfs | ||
hpfs | ||
hugetlbfs | ||
iomap | ||
isofs | ||
jbd2 | ||
jffs2 | ||
jfs | ||
kernfs | ||
lockd | ||
minix | ||
nfs | ||
nfs_common | ||
nfsd | ||
nilfs2 | ||
nls | ||
notify | ||
ntfs | ||
ocfs2 | ||
omfs | ||
openpromfs | ||
orangefs | ||
overlayfs | ||
proc | ||
pstore | ||
qnx4 | ||
qnx6 | ||
quota | ||
ramfs | ||
reiserfs | ||
romfs | ||
squashfs | ||
sysfs | ||
sysv | ||
tracefs | ||
ubifs | ||
udf | ||
ufs | ||
unicode | ||
verity | ||
xfs | ||
Kconfig | -rw-r--r-- | 7.6 KB |
Kconfig.binfmt | -rw-r--r-- | 7.6 KB |
Makefile | -rw-r--r-- | 4.4 KB |
aio.c | -rw-r--r-- | 56.0 KB |
anon_inodes.c | -rw-r--r-- | 4.6 KB |
attr.c | -rw-r--r-- | 9.6 KB |
bad_inode.c | -rw-r--r-- | 5.3 KB |
binfmt_aout.c | -rw-r--r-- | 8.3 KB |
binfmt_elf.c | -rw-r--r-- | 63.0 KB |
binfmt_elf_fdpic.c | -rw-r--r-- | 47.1 KB |
binfmt_em86.c | -rw-r--r-- | 2.8 KB |
binfmt_flat.c | -rw-r--r-- | 28.0 KB |
binfmt_misc.c | -rw-r--r-- | 18.5 KB |
binfmt_script.c | -rw-r--r-- | 4.4 KB |
block_dev.c | -rw-r--r-- | 55.9 KB |
buffer.c | -rw-r--r-- | 90.2 KB |
char_dev.c | -rw-r--r-- | 16.5 KB |
compat.c | -rw-r--r-- | 3.2 KB |
compat_binfmt_elf.c | -rw-r--r-- | 3.2 KB |
compat_ioctl.c | -rw-r--r-- | 31.0 KB |
coredump.c | -rw-r--r-- | 22.1 KB |
d_path.c | -rw-r--r-- | 11.3 KB |
dax.c | -rw-r--r-- | 45.8 KB |
dcache.c | -rw-r--r-- | 83.9 KB |
dcookies.c | -rw-r--r-- | 7.1 KB |
direct-io.c | -rw-r--r-- | 40.8 KB |
drop_caches.c | -rw-r--r-- | 1.8 KB |
eventfd.c | -rw-r--r-- | 11.1 KB |
eventpoll.c | -rw-r--r-- | 64.5 KB |
exec.c | -rw-r--r-- | 46.9 KB |
fcntl.c | -rw-r--r-- | 23.3 KB |
fhandle.c | -rw-r--r-- | 6.8 KB |
file.c | -rw-r--r-- | 24.2 KB |
file_table.c | -rw-r--r-- | 10.2 KB |
filesystems.c | -rw-r--r-- | 6.4 KB |
fs-writeback.c | -rw-r--r-- | 74.4 KB |
fs_context.c | -rw-r--r-- | 18.1 KB |
fs_parser.c | -rw-r--r-- | 11.0 KB |
fs_pin.c | -rw-r--r-- | 1.9 KB |
fs_struct.c | -rw-r--r-- | 3.3 KB |
fs_types.c | -rw-r--r-- | 2.5 KB |
fsopen.c | -rw-r--r-- | 11.2 KB |
inode.c | -rw-r--r-- | 60.7 KB |
internal.h | -rw-r--r-- | 5.1 KB |
io_uring.c | -rw-r--r-- | 95.1 KB |
ioctl.c | -rw-r--r-- | 17.7 KB |
libfs.c | -rw-r--r-- | 32.9 KB |
locks.c | -rw-r--r-- | 78.9 KB |
mbcache.c | -rw-r--r-- | 12.0 KB |
mount.h | -rw-r--r-- | 4.0 KB |
mpage.c | -rw-r--r-- | 21.1 KB |
namei.c | -rw-r--r-- | 122.8 KB |
namespace.c | -rw-r--r-- | 97.0 KB |
no-block.c | -rw-r--r-- | 478 bytes |
nsfs.c | -rw-r--r-- | 6.1 KB |
open.c | -rw-r--r-- | 30.2 KB |
pipe.c | -rw-r--r-- | 27.7 KB |
pnode.c | -rw-r--r-- | 15.1 KB |
pnode.h | -rw-r--r-- | 1.9 KB |
posix_acl.c | -rw-r--r-- | 21.5 KB |
proc_namespace.c | -rw-r--r-- | 7.8 KB |
read_write.c | -rw-r--r-- | 51.6 KB |
readdir.c | -rw-r--r-- | 13.3 KB |
select.c | -rw-r--r-- | 34.2 KB |
seq_file.c | -rw-r--r-- | 24.7 KB |
signalfd.c | -rw-r--r-- | 9.0 KB |
splice.c | -rw-r--r-- | 40.2 KB |
stack.c | -rw-r--r-- | 2.5 KB |
stat.c | -rw-r--r-- | 19.4 KB |
statfs.c | -rw-r--r-- | 9.6 KB |
super.c | -rw-r--r-- | 47.9 KB |
sync.c | -rw-r--r-- | 10.4 KB |
timerfd.c | -rw-r--r-- | 13.5 KB |
userfaultfd.c | -rw-r--r-- | 51.2 KB |
utimes.c | -rw-r--r-- | 7.3 KB |
xattr.c | -rw-r--r-- | 23.5 KB |
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