linux-kernel - [PATCH v2 3/7] dmaengine: idxd: fix memory leak in error handling path of idxd_setup

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Message-ID: <20250215054431.55747-4-xueshuai@linux.alibaba.com>
Date: Sat, 15 Feb 2025 13:44:27 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: vinicius.gomes@...el.com,
	dave.jiang@...el.com,
	vkoul@...nel.org
Cc: nikhil.rao@...el.com,
	xueshuai@...ux.alibaba.com,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/7] dmaengine: idxd: fix memory leak in error handling path of idxd_setup_groups

Memory allocated for groups is not freed if an error occurs during
idxd_setup_groups(). To fix it, free the allocated memory in the reverse
order of allocation before exiting the function in case of an error.

Fixes: defe49f96012 ("dmaengine: idxd: fix group conf_dev lifetime")
Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
---
 drivers/dma/idxd/init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 4e47075c5bef..a2da68e6144d 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -328,6 +328,7 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 		rc = dev_set_name(conf_dev, "group%d.%d", idxd->id, group->id);
 		if (rc < 0) {
 			put_device(conf_dev);
+			kfree(group);
 			goto err;
 		}
 
@@ -352,7 +353,10 @@ static int idxd_setup_groups(struct idxd_device *idxd)
 	while (--i >= 0) {
 		group = idxd->groups[i];
 		put_device(group_confdev(group));
+		kfree(group);
 	}
+	kfree(idxd->groups);
+
 	return rc;
 }
 
-- 
2.39.3