[PATCH] x86/pmem: Fix a null pointer dereference in register_e820_pmem()

Add check for the return value of platform_device_alloc() to prevent null pointer dereference.

Fixes: 7a67832c7e44 ("libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a tristate option") Cc: stable@vger.kernel.org Signed-off-by: Haoxiang Li haoxiang_li2024@163.com --- 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)