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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, QintaoShen <unSimple1993@163.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.18 586/879] soc: bcm: Check for NULL return of devm_kzalloc()
Date:   Tue,  7 Jun 2022 19:01:44 +0200
Message-Id: <20220607165019.862167410@linuxfoundation.org>
In-Reply-To: <20220607165002.659942637@linuxfoundation.org>
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From: QintaoShen <unSimple1993@163.com>

[ Upstream commit b4bd2aafacce48db26b0a213d849818d940556dd ]

As the potential failure of allocation, devm_kzalloc() may return NULL.  Then
the 'pd->pmb' and the follow lines of code may bring null pointer dereference.

Therefore, it is better to check the return value of devm_kzalloc() to avoid
this confusion.

Fixes: 8bcac4011ebe ("soc: bcm: add PM driver for Broadcom's PMB")
Signed-off-by: QintaoShen <unSimple1993@163.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/soc/bcm/bcm63xx/bcm-pmb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/bcm/bcm63xx/bcm-pmb.c b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
index 7bbe46ea5f94..9407cac47fdb 100644
--- a/drivers/soc/bcm/bcm63xx/bcm-pmb.c
+++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
@@ -312,6 +312,9 @@ static int bcm_pmb_probe(struct platform_device *pdev)
 	for (e = table; e->name; e++) {
 		struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 
+		if (!pd)
+			return -ENOMEM;
+
 		pd->pmb = pmb;
 		pd->data = e;
 		pd->genpd.name = e->name;
-- 
2.35.1