[v1] x86/pmem: Fix a null pointer dereference in register_e820_pmem()

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

Haoxiang Li posted 1 patch 6 months, 3 weeks ago

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arch/x86/kernel/pmem.c | 2 ++
1 file changed, 2 insertions(+)

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

Posted by Haoxiang Li 6 months, 3 weeks ago

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)
-- 
2.25.1