linux-kernel - [PATCH v2] ata: libata: Fix memory leak for error path in ata_host

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Message-Id: <20240822033050.2909195-1-zhengqixing@huaweicloud.com>
Date: Thu, 22 Aug 2024 11:30:50 +0800
From: Zheng Qixing <zhengqixing@...weicloud.com>
To: dlemoal@...nel.org,
	cassel@...nel.org
Cc: linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai3@...wei.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	zhengqixing@...wei.com
Subject: [PATCH v2] ata: libata: Fix memory leak for error path in ata_host_alloc()

From: Zheng Qixing <zhengqixing@...wei.com>

In ata_host_alloc(), if ata_port_alloc(host) fails to allocate memory
for a port, the allocated 'host' structure is not freed before returning
from the function. This results in a potential memory leak.

This patch adds a kfree(host) before the error handling code is executed
to ensure that the 'host' structure is properly freed in case of an
allocation failure.

Signed-off-by: Zheng Qixing <zhengqixing@...wei.com>
---
Changes in v2:
 - error path is wrong in v1

 drivers/ata/libata-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e4023fc288ac..f27a18990c38 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5663,8 +5663,10 @@ struct ata_host *ata_host_alloc(struct device *dev, int n_ports)
 	}
 
 	dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
-	if (!dr)
+	if (!dr) {
+		kfree(host);
 		goto err_out;
+	}
 
 	devres_add(dev, dr);
 	dev_set_drvdata(dev, host);
-- 
2.39.2