MIPS: lantiq: check the return value of kzalloc()

stable inclusion
from stable-v5.10.118
commit 9b7f3211064dcb7c59f0fc2f10b26652267d9800
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L686

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=9b7f3211064dcb7c59f0fc2f10b26652267d9800

--------------------------------

[ Upstream commit 34123208 ]

kzalloc() is a memory allocation function which can return NULL when
some internal memory errors happen. So it is better to check the
return value of it to prevent potential wrong memory access or
memory leak.
Signed-off-by: NXiaoke Wang <xkernel.wang@foxmail.com>
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

arch/mips/lantiq/falcon/sysctrl.c

@@ -167,6 +167,8 @@ static inline void clkdev_add_sys(const char *dev, unsigned int module,
 {
 	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 
+	if (!clk)
+		return;
 	clk->cl.dev_id = dev;
 	clk->cl.con_id = NULL;
 	clk->cl.clk = clk;

arch/mips/lantiq/xway/gptu.c

@@ -122,6 +122,8 @@ static inline void clkdev_add_gptu(struct device *dev, const char *con,
 {
 	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 
+	if (!clk)
+		return;
 	clk->cl.dev_id = dev_name(dev);
 	clk->cl.con_id = con;
 	clk->cl.clk = clk;

arch/mips/lantiq/xway/sysctrl.c

@@ -315,6 +315,8 @@ static void clkdev_add_pmu(const char *dev, const char *con, bool deactivate,
 {
 	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 
+	if (!clk)
+		return;
 	clk->cl.dev_id = dev;
 	clk->cl.con_id = con;
 	clk->cl.clk = clk;
@@ -338,6 +340,8 @@ static void clkdev_add_cgu(const char *dev, const char *con,
 {
 	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
 
+	if (!clk)
+		return;
 	clk->cl.dev_id = dev;
 	clk->cl.con_id = con;
 	clk->cl.clk = clk;
@@ -356,6 +360,7 @@ static void clkdev_add_pci(void)
 	struct clk *clk_ext = kzalloc(sizeof(struct clk), GFP_KERNEL);
 
 	/* main pci clock */
+	if (clk) {
 		clk->cl.dev_id = "17000000.pci";
 		clk->cl.con_id = NULL;
 		clk->cl.clk = clk;
@@ -366,14 +371,17 @@ static void clkdev_add_pci(void)
 		clk->module = 0;
 		clk->bits = PMU_PCI;
 		clkdev_add(&clk->cl);
+	}
 
 	/* use internal/external bus clock */
+	if (clk_ext) {
 		clk_ext->cl.dev_id = "17000000.pci";
 		clk_ext->cl.con_id = "external";
 		clk_ext->cl.clk = clk_ext;
 		clk_ext->enable = pci_ext_enable;
 		clk_ext->disable = pci_ext_disable;
 		clkdev_add(&clk_ext->cl);
+	}
 }
 
 /* xway socs can generate clocks on gpio pins */
@@ -393,9 +401,15 @@ static void clkdev_add_clkout(void)
 		char *name;
 
 		name = kzalloc(sizeof("clkout0"), GFP_KERNEL);
+		if (!name)
+			continue;
 		sprintf(name, "clkout%d", i);
 
 		clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
+		if (!clk) {
+			kfree(name);
+			continue;
+		}
 		clk->cl.dev_id = "1f103000.cgu";
 		clk->cl.con_id = name;
 		clk->cl.clk = clk;