linux-kernel - [PATCH v1] soc: bcm: Check for NULL return of devm

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Date:   Thu, 24 Mar 2022 16:35:40 +0800
From:   QintaoShen <unSimple1993@....com>
To:     f.fainelli@...il.com
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, QintaoShen <unSimple1993@....com>
Subject: [PATCH v1] soc: bcm: Check for NULL return of devm_kzalloc()

As the potential failuer 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.

Signed-off-by: QintaoShen <unSimple1993@....com>
---
 drivers/soc/bcm/bcm63xx/bcm-pmb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/soc/bcm/bcm63xx/bcm-pmb.c b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
index 7bbe46e..55bf389 100644
--- a/drivers/soc/bcm/bcm63xx/bcm-pmb.c
+++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
@@ -311,6 +311,8 @@ 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;
-- 
2.7.4