[PATCH] x86: pmem: Add NULL check for platform_device_alloc

[Li Jun]

Add proper error handling for the case when platform_device_alloc()
returns NULL due to memory allocation failure. This prevents a
potential NULL pointer dereference when trying to use the pdev pointer
without checking if allocation succeeded.

Signed-off-by: Li Jun <lijun01@xxxxxxxxxx>
---
 arch/x86/kernel/pmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c
index 23154d24b117..04fb221716ff 100644
--- a/arch/x86/kernel/pmem.c
+++ b/arch/x86/kernel/pmem.c
@@ -27,6 +27,8 @@ static __init int register_e820_pmem(void)
 	 * simply here to trigger the module to load on demand.
 	 */
 	pdev = platform_device_alloc("e820_pmem", -1);
+	if (!pdev)
+		return -ENOMEM;
 
 	rc = platform_device_add(pdev);
 	if (rc)
-- 
2.25.1