The GET_INSTANCE_ID macro that caused a kernel panic when accessing sysfs
attributes:
1. Off-by-one error: The loop condition used '<=' instead of '<',
causing access beyond array bounds. Since array indices are 0-based
and go from 0 to instances_count-1, the loop should use '<'.
2. Missing NULL check: The code dereferenced attr_name_kobj->name
without checking if attr_name_kobj was NULL, causing a null pointer
dereference in min_length_show() and other attribute show functions.
The panic occurred when fwupd tried to read BIOS configuration attributes:
Oops: general protection fault [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
RIP: 0010:min_length_show+0xcf/0x1d0 [hp_bioscfg]
Add a NULL check for attr_name_kobj before dereferencing and corrects
the loop boundary to match the pattern used elsewhere in the driver.
Cc: stable@vger.kernel.org
Fixes: 5f94f181ca ("platform/x86: hp-bioscfg: bioscfg-h")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20260115203725.828434-3-mario.limonciello@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Add definitions, macros, and prototypes for hp-bioscfg.
HP BIOS Configuration driver purpose is to provide a driver supporting
the latest sysfs class firmware attributes framework allowing the user
to change BIOS settings and security solutions on HP Inc.’s commercial
notebooks.
Signed-off-by: Jorge Lopez <jorge.lopez2@hp.com>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230608163319.18934-3-jorge.lopez2@hp.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
