6.4-stable review patch. If anyone has any objections, please let me know.
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From: Nikita Zhandarovich n.zhandarovich@fintech.ru
[ Upstream commit 6f20d3261265885f6a6be4cda49d7019728760e0 ]
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: 6a9ddc897883 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hid/hid-logitech-dj.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c index 62180414efccd..e6a8b6d8eab70 100644 --- a/drivers/hid/hid-logitech-dj.c +++ b/drivers/hid/hid-logitech-dj.c @@ -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);