From: Johan Hovold <johan@kernel.org>
Date: Mon, 20 Jun 2022 14:07:23 +0000 (+0200)
Subject: x86/pmem: Fix platform-device leak in error path
X-Git-Tag: for-5.20/block-2022-08-04~167^2~2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=229e73d46994f15314f58b2d39bf952111d89193;p=linux-block.git

x86/pmem: Fix platform-device leak in error path

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@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220620140723.9810-1-johan@kernel.org
---

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);