HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients

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[ Upstream commit 56f7db581e ]

During a warm reset flow, the cl->device pointer may be NULL if the
reset occurs while clients are still being enumerated. Accessing
cl->device->reference_count without a NULL check leads to a kernel panic.

This issue was identified during multi-unit warm reboot stress clycles.
Add a defensive NULL check for cl->device to ensure stability under
such intensive testing conditions.

KASAN: null-ptr-deref in range [0000000000000000-0000000000000007]
Workqueue: ish_fw_update_wq fw_reset_work_fn

Call Trace:
 ishtp_bus_remove_all_clients+0xbe/0x130 [intel_ishtp]
 ishtp_reset_handler+0x85/0x1a0 [intel_ishtp]
 fw_reset_work_fn+0x8a/0xc0 [intel_ish_ipc]

Fixes: 3703f53b99 ("HID: intel_ish-hid: ISH Transport layer")
Signed-off-by: Ryan Lin <ryan.lin@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Ryan Lin 2026-01-30 13:34:56 +08:00 • committed by Greg Kroah-Hartman

parent 5a68d2c99c

commit feb4bcfd40

1 changed files with 1 additions and 1 deletions

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drivers/hid/intel-ish-hid/ishtp/bus.c

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