linux-kernel - [PATCH -next,v2] nvmem: core: Fix memleak in nvmem

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Date:   Sat, 16 Jul 2022 17:52:57 +0800
From:   Gaosheng Cui <cuigaosheng1@...wei.com>
To:     <cuigaosheng1@...wei.com>, <srinivas.kandagatla@...aro.org>,
        <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <gongruiqi1@...wei.com>,
        <wangweiyang2@...wei.com>
Subject: [PATCH -next,v2] nvmem: core: Fix memleak in nvmem_register()

dev_set_name will alloc memory for nvmem->dev.kobj.name in
nvmem_register, when nvmem_validate_keepouts failed, nvmem's
memory will be freed and return, but nobody will free memory
for nvmem->dev.kobj.name, there will be memleak, so moving
dev_set_name after nvmem_validate_keepouts to fix it.

Fixes: de0534df9347 ("nvmem: core: fix error handling while validating keepout regions")
Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
---
 drivers/nvmem/core.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 1e3c754efd0d..a5d75edf509d 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -808,20 +808,6 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	else if (!config->no_of_node)
 		nvmem->dev.of_node = config->dev->of_node;
 
-	switch (config->id) {
-	case NVMEM_DEVID_NONE:
-		dev_set_name(&nvmem->dev, "%s", config->name);
-		break;
-	case NVMEM_DEVID_AUTO:
-		dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
-		break;
-	default:
-		dev_set_name(&nvmem->dev, "%s%d",
-			     config->name ? : "nvmem",
-			     config->name ? config->id : nvmem->id);
-		break;
-	}
-
 	nvmem->read_only = device_property_present(config->dev, "read-only") ||
 			   config->read_only || !nvmem->reg_write;
 
@@ -838,6 +824,20 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 		}
 	}
 
+	switch (config->id) {
+	case NVMEM_DEVID_NONE:
+		dev_set_name(&nvmem->dev, "%s", config->name);
+		break;
+	case NVMEM_DEVID_AUTO:
+		dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
+		break;
+	default:
+		dev_set_name(&nvmem->dev, "%s%d",
+			     config->name ? : "nvmem",
+			     config->name ? config->id : nvmem->id);
+		break;
+	}
+
 	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
 
 	rval = device_register(&nvmem->dev);
-- 
2.25.1