[PATCH 5.19 0213/1157] x86/pmem: Fix platform-device leak in error path

[Greg Kroah-Hartman]

From: Johan Hovold <johan@xxxxxxxxxx>

[ Upstream commit 229e73d46994f15314f58b2d39bf952111d89193 ]

Make sure to free the platform device in the unlikely event that
registration fails.

Fixes: 7a67832c7e44 ("libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a tristate option")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lore.kernel.org/r/20220620140723.9810-1-johan@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/x86/kernel/pmem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c
index 6b07faaa1579..23154d24b117 100644
--- a/arch/x86/kernel/pmem.c
+++ b/arch/x86/kernel/pmem.c
@@ -27,6 +27,11 @@ static __init int register_e820_pmem(void)
 	 * simply here to trigger the module to load on demand.
 	 */
 	pdev = platform_device_alloc("e820_pmem", -1);
-	return platform_device_add(pdev);
+
+	rc = platform_device_add(pdev);
+	if (rc)
+		platform_device_put(pdev);
+
+	return rc;
 }
 device_initcall(register_e820_pmem);
-- 
2.35.1