[PATCH v2] Loongarch: env: fix missing NULL checks for kstrdup

[Li Jun]

Fixes potential kernel oops during early boot when memory
allocation fails while parsing CPU model from device tree.
before return -ENOMEM, of_node_put(root) first.

Signed-off-by: Li Jun <lijun01@xxxxxxxxxx>
---
 arch/loongarch/kernel/env.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
index 841206fde3ab..c586de80027c 100644
--- a/arch/loongarch/kernel/env.c
+++ b/arch/loongarch/kernel/env.c
@@ -49,6 +49,10 @@ static int __init init_cpu_fullname(void)
 	ret = of_property_read_string(root, "model", &model);
 	if (ret == 0) {
 		cpuname = kstrdup(model, GFP_KERNEL);
+		if (!cpuname) {
+			of_node_put(root);
+			return -ENOMEM;
+		}
 		loongson_sysconf.cpuname = strsep(&cpuname, " ");
 	}
 	of_node_put(root);
-- 
2.25.1