linux-kernel - [PATCH] cxl: core-pmu: Fix the usage of uninitialized variable

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Message-ID: <20241023105610.668964-1-quzicheng@huawei.com>
Date: Wed, 23 Oct 2024 10:56:10 +0000
From: Zicheng Qu <quzicheng@...wei.com>
To: <dave@...olabs.net>, <jonathan.cameron@...wei.com>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
	<dan.j.williams@...el.com>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <tanghui20@...wei.com>, <zhangqiao22@...wei.com>,
	<judy.chenhui@...wei.com>, <quzicheng@...wei.com>
Subject: [PATCH] cxl: core-pmu: Fix the usage of uninitialized variable

In the devm_cxl_pmu_add() function, the variable rc might be
uninitialized before its first use 'if (rc) goto err', leading
to undefined behavior since its value depends on the compiler.
Currently, the switch statement is limited to the CXL_PMU_MEMDEV type.
If additional types are introduced, it could lead to similar concerns.
If the type range remains unchanged, using a switch case is unnecessary.
To enhance code extensibility and stability, it is recommended to
address this potential aspect.

Cc: stable@...r.kernel.org # v6.6+
Fixes: 1ad3f701c399 ("cxl/pci: Find and register CXL PMU devices")
Signed-off-by: Zicheng Qu <quzicheng@...wei.com>
---
 drivers/cxl/core/pmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cxl/core/pmu.c b/drivers/cxl/core/pmu.c
index 5d8e06b0ba6e..2d12887c9915 100644
--- a/drivers/cxl/core/pmu.c
+++ b/drivers/cxl/core/pmu.c
@@ -51,6 +51,9 @@ int devm_cxl_pmu_add(struct device *parent, struct cxl_pmu_regs *regs,
 	case CXL_PMU_MEMDEV:
 		rc = dev_set_name(dev, "pmu_mem%d.%d", assoc_id, index);
 		break;
+	default:
+		rc = -EINVAL;
+		break;
 	}
 	if (rc)
 		goto err;
-- 
2.34.1