From 6f20d3261265885f6a6be4cda49d7019728760e0 Mon Sep 17 00:00:00 2001
From: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Date: Tue, 13 Jun 2023 03:16:35 -0700
Subject: [PATCH] HID: logitech-dj: Fix error handling in logi_dj_recv_switch_to_dj_mode()
Git-commit: 6f20d3261265885f6a6be4cda49d7019728760e0
Patch-mainline: v6.6-rc1
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 fef67da0de53..8afe3be683ba 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);
--
2.35.3