linux-kernel - [PATCH v2] drivers/base/node: Handle error properly in register_one

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Message-ID: <20250822084845.19219-1-donettom@linux.ibm.com>
Date: Fri, 22 Aug 2025 14:18:45 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>, Zi Yan <ziy@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Ritesh Harjani <ritesh.list@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, "Rafael J . Wysocki" <rafael@...nel.org>,
        Danilo Krummrich <dakr@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Yury Norov <yury.norov@...il.com>, Dave Jiang <dave.jiang@...el.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
        Donet Tom <donettom@...ux.ibm.com>
Subject: [PATCH v2] drivers/base/node: Handle error properly in register_one_node()

If register_node() returns an error, it is not handled correctly.
The function will proceed further and try to register CPUs under the
node, which is not correct.

So, in this patch, if register_node() returns an error, we return
immediately from the function.

Fixes: 76b67ed9dce6 ("[PATCH] node hotplug: register cpu: remove node struct")
Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
---
v1 -> v2
Made the changes based on Oscar’s review comments.

v1 - https://lore.kernel.org/all/20250702112856.295176-1-donettom@linux.ibm.com/
---
 drivers/base/node.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index c65b4917794e..1608816de67f 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -883,6 +883,11 @@ int register_one_node(int nid)
 	node_devices[nid] = node;
 
 	error = register_node(node_devices[nid], nid);
+	if (error) {
+		node_devices[nid] = NULL;
+		kfree(node);
+		return error;
+	}
 
 	/* link cpu under this node */
 	for_each_present_cpu(cpu) {
-- 
2.50.1