soc: bcm: Check for NULL return of devm_kzalloc()

[ 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>

diff --git a/drivers/soc/bcm/bcm63xx/bcm-pmb.c b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
index 774465c..2ac2008 100644 (file)
--- a/drivers/soc/bcm/bcm63xx/bcm-pmb.c
+++ b/drivers/soc/bcm/bcm63xx/bcm-pmb.c
@@ -314,6 +314,9 @@ 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;