[PATCH 1/2] HID: intel-ish-hid: Fix use-after-free issue in hid_ishtp_cl_remove()

[Zhang Lixu <lixu.zhang@intel.com>]

During the `rmmod` operation for the `intel_ishtp_hid` driver, a
use-after-free issue can occur in the hid_ishtp_cl_remove() function.
The function hid_ishtp_cl_deinit() is called before ishtp_hid_remove(),
which can lead to accessing freed memory or resources during the
removal process.

Call Trace:
 ? ishtp_cl_send+0x168/0x220 [intel_ishtp]
 ? hid_output_report+0xe3/0x150 [hid]
 hid_ishtp_set_feature+0xb5/0x120 [intel_ishtp_hid]
 ishtp_hid_request+0x7b/0xb0 [intel_ishtp_hid]
 hid_hw_request+0x1f/0x40 [hid]
 sensor_hub_set_feature+0x11f/0x190 [hid_sensor_hub]
 _hid_sensor_power_state+0x147/0x1e0 [hid_sensor_trigger]
 hid_sensor_runtime_resume+0x22/0x30 [hid_sensor_trigger]
 sensor_hub_remove+0xa8/0xe0 [hid_sensor_hub]
 hid_device_remove+0x49/0xb0 [hid]
 hid_destroy_device+0x6f/0x90 [hid]
 ishtp_hid_remove+0x42/0x70 [intel_ishtp_hid]
 hid_ishtp_cl_remove+0x6b/0xb0 [intel_ishtp_hid]
 ishtp_cl_device_remove+0x4a/0x60 [intel_ishtp]
 ...

Additionally, ishtp_hid_remove() is a HID level power off, which should
occur before the ISHTP level disconnect.

This patch resolves the issue by reordering the calls in
hid_ishtp_cl_remove(). The function ishtp_hid_remove() is now
called before hid_ishtp_cl_deinit().

Fixes: f645a90e8ff7 ("HID: intel-ish-hid: ishtp-hid-client: use helper functions for connection")
Signed-off-by: Zhang Lixu <lixu.zhang@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 drivers/hid/intel-ish-hid/ishtp-hid-client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/intel-ish-hid/ishtp-hid-client.c b/drivers/hid/intel-ish-hid/ishtp-hid-client.c
index cb04cd1d980b..6550ad5bfbb5 100644
--- a/drivers/hid/intel-ish-hid/ishtp-hid-client.c
+++ b/drivers/hid/intel-ish-hid/ishtp-hid-client.c
@@ -832,9 +832,9 @@ static void hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 			hid_ishtp_cl);
 
 	dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
-	hid_ishtp_cl_deinit(hid_ishtp_cl);
 	ishtp_put_device(cl_device);
 	ishtp_hid_remove(client_data);
+	hid_ishtp_cl_deinit(hid_ishtp_cl);
 
 	hid_ishtp_cl = NULL;
 
-- 
2.43.0