diff options
| author | Ryan Lin <ryan.lin@intel.com> | 2026-01-30 13:34:56 +0800 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.com> | 2026-02-02 14:37:57 +0100 |
| commit | 56f7db581ee73af53cd512e00a6261a025bf1d58 (patch) | |
| tree | 5329b25c9f1a088632c9a0c58c886c8dda432b5a | |
| parent | af4fe07a9d963a72438ade96cf090e84b3399d0c (diff) | |
HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients
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: 3703f53b99e4a ("HID: intel_ish-hid: ISH Transport layer")
Signed-off-by: Ryan Lin <ryan.lin@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp/bus.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/bus.c b/drivers/hid/intel-ish-hid/ishtp/bus.c index c3915f3a060e..b890fbf97a75 100644 --- a/drivers/hid/intel-ish-hid/ishtp/bus.c +++ b/drivers/hid/intel-ish-hid/ishtp/bus.c @@ -730,7 +730,7 @@ void ishtp_bus_remove_all_clients(struct ishtp_device *ishtp_dev, spin_lock_irqsave(&ishtp_dev->cl_list_lock, flags); list_for_each_entry(cl, &ishtp_dev->cl_list, link) { cl->state = ISHTP_CL_DISCONNECTED; - if (warm_reset && cl->device->reference_count) + if (warm_reset && cl->device && cl->device->reference_count) continue; /* |