[PATCH 2/2] loongarch/env: fix missing NULL check after kstrdup()

[Jackie Liu <liu.yun@linux.dev>]

From: Jackie Liu <liuyun01@kylinos.cn>

The result of kstrdup() may be NULL when memory allocation fails.
In init_cpu_fullname(), the return value was used directly by strsep()
without validation, which could lead to NULL pointer dereference.

Add a proper check for the kstrdup() result and return -ENOMEM when
allocation fails.

Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
---
 arch/loongarch/kernel/env.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
index c0a5dc9aeae2..b41a65ec45c3 100644
--- a/arch/loongarch/kernel/env.c
+++ b/arch/loongarch/kernel/env.c
@@ -49,6 +49,8 @@ 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)
+			return -ENOMEM;
 		loongson_sysconf.cpuname = strsep(&cpuname, " ");
 	}
 	of_node_put(root);
-- 
2.51.0