linux-kernel - [PATCH] power: supply: Fix null pointer dereference in smb2

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Message-Id: <20231124075021.1335289-1-chentao@kylinos.cn>
Date:   Fri, 24 Nov 2023 15:50:21 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        sre@...nel.org, caleb.connolly@...aro.org
Cc:     kunwu.chan@...mail.com, linux-arm-msm@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kunwu Chan <chentao@...inos.cn>
Subject: [PATCH] power: supply: Fix null pointer dereference in smb2_probe

devm_kasprintf and devm_kzalloc return a pointer to dynamically
allocated memory which can be NULL upon failure.

Fixes: 8648aeb5d7b7 ("power: supply: add Qualcomm PMI8998 SMB2 Charger driver")
Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 drivers/power/supply/qcom_pmi8998_charger.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/power/supply/qcom_pmi8998_charger.c b/drivers/power/supply/qcom_pmi8998_charger.c
index 8acf63ee6897..9bb777406013 100644
--- a/drivers/power/supply/qcom_pmi8998_charger.c
+++ b/drivers/power/supply/qcom_pmi8998_charger.c
@@ -972,10 +972,14 @@ static int smb2_probe(struct platform_device *pdev)
 	supply_config.of_node = pdev->dev.of_node;
 
 	desc = devm_kzalloc(chip->dev, sizeof(smb2_psy_desc), GFP_KERNEL);
+	if (!desc)
+		return -ENOMEM;
 	memcpy(desc, &smb2_psy_desc, sizeof(smb2_psy_desc));
 	desc->name =
 		devm_kasprintf(chip->dev, GFP_KERNEL, "%s-charger",
 			       (const char *)device_get_match_data(chip->dev));
+	if (!desc->name)
+		return -ENOMEM;
 
 	chip->chg_psy =
 		devm_power_supply_register(chip->dev, desc, &supply_config);
-- 
2.34.1