linux-kernel - [PATCH 03/13] nvmem: core: add error handling for dev_set

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Date:   Fri, 16 Sep 2022 13:20:50 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Gaosheng Cui <cuigaosheng1@...wei.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 03/13] nvmem: core: add error handling for dev_set_name

From: Gaosheng Cui <cuigaosheng1@...wei.com>

The type of return value of dev_set_name is int, which may return
wrong result, so we add error handling for it to reclaim memory
of nvmem resource, and return early when an error occurs.

Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/core.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 2164efd12ba9..321d7d63e068 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -810,18 +810,24 @@ 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);
+		rval = dev_set_name(&nvmem->dev, "%s", config->name);
 		break;
 	case NVMEM_DEVID_AUTO:
-		dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
+		rval = dev_set_name(&nvmem->dev, "%s%d", config->name, nvmem->id);
 		break;
 	default:
-		dev_set_name(&nvmem->dev, "%s%d",
+		rval = dev_set_name(&nvmem->dev, "%s%d",
 			     config->name ? : "nvmem",
 			     config->name ? config->id : nvmem->id);
 		break;
 	}
 
+	if (rval) {
+		ida_free(&nvmem_ida, nvmem->id);
+		kfree(nvmem);
+		return ERR_PTR(rval);
+	}
+
 	nvmem->read_only = device_property_present(config->dev, "read-only") ||
 			   config->read_only || !nvmem->reg_write;
 
-- 
2.25.1