linux-kernel - [PATCH] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230513111747.132532-1-krzysztof.kozlowski@linaro.org>
Date:   Sat, 13 May 2023 13:17:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thara Gopinath <thara.gopinath@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        Dan Carpenter <error27@...il.com>, stable@...r.kernel.org
Subject: [PATCH] soc: qcom: icc-bwmon: fix incorrect error code passed to dev_err_probe()

Pass to dev_err_probe() PTR_ERR from actual dev_pm_opp_find_bw_floor()
call which failed, instead of previous ret which at this point is 0.
Failure of dev_pm_opp_find_bw_floor() would result in prematurely ending
the probe with success.

Fixes smatch warnings:

  drivers/soc/qcom/icc-bwmon.c:776 bwmon_probe() warn: passing zero to 'dev_err_probe'
  drivers/soc/qcom/icc-bwmon.c:781 bwmon_probe() warn: passing zero to 'dev_err_probe'

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Link: https://lore.kernel.org/r/202305131657.76XeHDjF-lkp@intel.com/
Cc: <stable@...r.kernel.org>
Fixes: b9c2ae6cac40 ("soc: qcom: icc-bwmon: Add bandwidth monitoring driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

---

Code was tested previously with smatch. Just this test in smatch is new.
---
 drivers/soc/qcom/icc-bwmon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c
index fd58c5b69897..f65bfeca7ed6 100644
--- a/drivers/soc/qcom/icc-bwmon.c
+++ b/drivers/soc/qcom/icc-bwmon.c
@@ -773,12 +773,12 @@ static int bwmon_probe(struct platform_device *pdev)
 	bwmon->max_bw_kbps = UINT_MAX;
 	opp = dev_pm_opp_find_bw_floor(dev, &bwmon->max_bw_kbps, 0);
 	if (IS_ERR(opp))
-		return dev_err_probe(dev, ret, "failed to find max peak bandwidth\n");
+		return dev_err_probe(dev, PTR_ERR(opp), "failed to find max peak bandwidth\n");
 
 	bwmon->min_bw_kbps = 0;
 	opp = dev_pm_opp_find_bw_ceil(dev, &bwmon->min_bw_kbps, 0);
 	if (IS_ERR(opp))
-		return dev_err_probe(dev, ret, "failed to find min peak bandwidth\n");
+		return dev_err_probe(dev, PTR_ERR(opp), "failed to find min peak bandwidth\n");
 
 	bwmon->dev = dev;
 
-- 
2.34.1