linux-kernel - [PATCH 5.4 121/475] soc: qcom: rpmpd: Check for null return of devm

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Message-Id: <20220414110858.539024926@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:08:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 121/475] soc: qcom: rpmpd: Check for null return of devm_kcalloc

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit 5a811126d38f9767a20cc271b34db7c8efc5a46c ]

Because of the possible failure of the allocation, data->domains might
be NULL pointer and will cause the dereference of the NULL pointer
later.
Therefore, it might be better to check it and directly return -ENOMEM
without releasing data manually if fails, because the comment of the
devm_kmalloc() says "Memory allocated with this function is
automatically freed on driver detach.".

Fixes: bbe3a66c3f5a ("soc: qcom: rpmpd: Add a Power domain driver to model corners")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lore.kernel.org/r/20211231094419.1941054-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/qcom/rpmpd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/qcom/rpmpd.c b/drivers/soc/qcom/rpmpd.c
index 3c1a55cf25d6..4715acfecff4 100644
--- a/drivers/soc/qcom/rpmpd.c
+++ b/drivers/soc/qcom/rpmpd.c
@@ -362,6 +362,9 @@ static int rpmpd_probe(struct platform_device *pdev)
 
 	data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
 				     GFP_KERNEL);
+	if (!data->domains)
+		return -ENOMEM;
+
 	data->num_domains = num;
 
 	for (i = 0; i < num; i++) {
-- 
2.34.1