diff options
| author | Phil Auld <pauld@redhat.com> | 2022-11-17 11:23:13 -0500 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-12-01 09:20:24 -0800 |
| commit | a89ff5f5cc64b9fe7a992cf56988fd36f56ca82a (patch) | |
| tree | d8e127ed83cd83cf0b5294f350050b615419aaf1 /drivers/hwmon/lm95234.c | |
| parent | e2a87785aab0dac190ac89be6a9ba955e2c634f2 (diff) | |
| download | linux-a89ff5f5cc64b9fe7a992cf56988fd36f56ca82a.tar.bz2 | |
hwmon: (coretemp) Check for null before removing sysfs attrs
If coretemp_add_core() gets an error then pdata->core_data[indx]
is already NULL and has been kfreed. Don't pass that to
sysfs_remove_group() as that will crash in sysfs_remove_group().
[Shortened for readability]
[91854.020159] sysfs: cannot create duplicate filename '/devices/platform/coretemp.0/hwmon/hwmon2/temp20_label'
<cpu offline>
[91855.126115] BUG: kernel NULL pointer dereference, address: 0000000000000188
[91855.165103] #PF: supervisor read access in kernel mode
[91855.194506] #PF: error_code(0x0000) - not-present page
[91855.224445] PGD 0 P4D 0
[91855.238508] Oops: 0000 [#1] PREEMPT SMP PTI
...
[91855.342716] RIP: 0010:sysfs_remove_group+0xc/0x80
...
[91855.796571] Call Trace:
[91855.810524] coretemp_cpu_offline+0x12b/0x1dd [coretemp]
[91855.841738] ? coretemp_cpu_online+0x180/0x180 [coretemp]
[91855.871107] cpuhp_invoke_callback+0x105/0x4b0
[91855.893432] cpuhp_thread_fun+0x8e/0x150
...
Fix this by checking for NULL first.
Signed-off-by: Phil Auld <pauld@redhat.com>
Cc: linux-hwmon@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20221117162313.3164803-1-pauld@redhat.com
Fixes: 199e0de7f5df3 ("hwmon: (coretemp) Merge pkgtemp with coretemp")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/lm95234.c')
0 files changed, 0 insertions, 0 deletions