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Code Issues Releases Wiki Activity

HID: logitech-dj: Fix error handling in logi_dj_recv_switch_to_dj_mode()

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Presently, if a call to logi_dj_recv_send_report() fails, we do
not learn about the error until after sending short
HID_OUTPUT_REPORT with hid_hw_raw_request().
To handle this somewhat unlikely issue, return on error in
logi_dj_recv_send_report() (minding ugly sleep workaround) and
take into account the result of hid_hw_raw_request().

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 6a9ddc8978 ("HID: logitech-dj: enable notifications on connect/disconnect")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Link: https://lore.kernel.org/r/20230613101635.77820-1-n.zhandarovich@fintech.ru
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Nikita Zhandarovich 2023-06-13 03:16:35 -07:00 committed by Benjamin Tissoires
parent ed1fb63b6e
commit 6f20d32612
1 changed files with 4 additions and 1 deletions
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5
drivers/hid/hid-logitech-dj.c
View file

@ -1285,6 +1285,9 @@ static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
* 50 msec should gives enough time to the receiver to be ready.
*/
msleep(50);
if (retval)
return retval;
}
/*
@ -1306,7 +1309,7 @@ static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
buf[5] = 0x09;
buf[6] = 0x00;
hid_hw_raw_request(hdev, REPORT_ID_HIDPP_SHORT, buf,
retval = hid_hw_raw_request(hdev, REPORT_ID_HIDPP_SHORT, buf,
HIDPP_REPORT_SHORT_LENGTH, HID_OUTPUT_REPORT,
HID_REQ_SET_REPORT);