[PATCH] meson-mx-socinfo: Fix possible null-pointer dereference issues in meson_mx_socinfo_init

[Kunwu Chan]

In meson_mx_socinfo_revision, kasprintf() returns a pointer
to dynamically allocated memory which can be NULL upon failure.

Similarly, the kstrdup_const in the meson_mx_socinfo_soc_id
returns a null pointer when it fails. Ensure the allocation was successful
by checking the pointer validity. Avoid null pointer dereference issues.

Signed-off-by: Kunwu Chan <chentao at kylinos.cn>
---
 drivers/soc/amlogic/meson-mx-socinfo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/amlogic/meson-mx-socinfo.c b/drivers/soc/amlogic/meson-mx-socinfo.c
index 92125dd65f33..9c0296599561 100644
--- a/drivers/soc/amlogic/meson-mx-socinfo.c
+++ b/drivers/soc/amlogic/meson-mx-socinfo.c
@@ -160,6 +160,12 @@ static int __init meson_mx_socinfo_init(void)
 							   metal_rev);
 	soc_dev_attr->soc_id = meson_mx_socinfo_soc_id(major_ver, metal_rev);
 
+	if (!soc_dev_attr->revision || !soc_dev_attr->soc_id) {
+		kfree_const(soc_dev_attr->revision);
+		kfree_const(soc_dev_attr->soc_id);
+		kfree(soc_dev_attr);
+		return -ENOMEM;
+	}
 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev)) {
 		kfree_const(soc_dev_attr->revision);
-- 
2.39.2