linux-kernel - Re: [PATCH] kobject: Safe return of kobject_get

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Message-ID: <YNNPVumB7LqLLWgW@kroah.com>
Date:   Wed, 23 Jun 2021 17:12:22 +0200
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Christian Löhle <CLoehle@...erstone.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rafael@...nel.org" <rafael@...nel.org>
Subject: Re: [PATCH] kobject: Safe return of kobject_get_path with NULL

On Wed, Jun 23, 2021 at 02:49:57PM +0000, Christian Löhle wrote:
> This prevents two Oopses I've encountered.
> (Sorry for the older kernel)
> 
> [ 4650.202534] general protection fault: 0000 [#1] PREEMPT SMP
> [ 4650.202554] Modules linked in: serio_raw atkbd libps2 aesni_intel aes_x86_64 crypto_simd glue_helper ahci libahci i8042 fam15h_power hwmon_vid k10temp scsi_mon ftdi_sio usbserial exfat ext4 crc16 mbcache jbd2 fscrypto sg fuse nls_iso8859_1 nls_cp437 vfat fat nfsv3 nfs_acl nfsv4 dns_resolver nfs lockd grace sunrpc fscache e1000e ptp pps_core i915 intel_gtt usbmon button serio ehci_pci ehci_hcd r8169 mii xhci_pci xhci_hcd libcrc32c crc32c_generic crc32c_intel crc32_pclmul radeon i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm agpgart ata_piix pata_acpi ata_generic libata uas usb_storage sd_mod scsi_mod isofs loop overlay ip_tables x_tables sch_fq_codel tpm_tis tpm_tis_core tpm lpc_ich ie31200_edac mei_me mei shpchp parport_pc battery fan thermal i2c_i801 intel_rapl_perf
> [ 4650.202746]  intel_cstate ghash_clmulni_intel cryptd crct10dif_pclmul ppdev parport mousedev input_leds iTCO_wdt iTCO_vendor_support kvm irqbypass evdev mac_hid eeepc_wmi asus_wmi sparse_keymap wmi led_class video coretemp intel_powerclamp x86_pkg_temp_thermal intel_rapl cfg80211 rfkill hid_generic usbhid hid usbcore usb_common
> [ 4650.202824] CPU: 0 PID: 20750 Comm: python3 Not tainted 4.13.5-1hyLinux #22

Lots of things have changed since this old kernel version.  Can you see
if this is still needed on Linus's tree?

thanks,

greg k-h