Commit a89ff5f5cc64 for kernel

commit a89ff5f5cc64b9fe7a992cf56988fd36f56ca82a
Author: Phil Auld <pauld@redhat.com>
Date:   Thu Nov 17 11:23:13 2022 -0500

    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>

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 8bf32c6c85d9..30a19d711f89 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -533,6 +533,10 @@ static void coretemp_remove_core(struct platform_data *pdata, int indx)
 {
 	struct temp_data *tdata = pdata->core_data[indx];

+	/* if we errored on add then this is already gone */
+	if (!tdata)
+		return;
+
 	/* Remove the sysfs attributes */
 	sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);