linux-kernel - [PATCH v3] net: mana: Fix possible double free in error handling path

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Message-Id: <20240625130314.2661257-1-make24@iscas.ac.cn>
Date: Tue, 25 Jun 2024 21:03:14 +0800
From: Ma Ke <make24@...as.ac.cn>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	shradhagupta@...ux.microsoft.com,
	horms@...nel.org,
	kotaranov@...rosoft.com,
	longli@...rosoft.com,
	schakrabarti@...ux.microsoft.com,
	erick.archer@...look.com,
	leon@...nel.org
Cc: linux-hyperv@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>
Subject: [PATCH v3] net: mana: Fix possible double free in error handling path

When auxiliary_device_add() returns error and then calls
auxiliary_device_uninit(), callback function adev_release
calls kfree(madev). We shouldn't call kfree(madev) again
in the error handling path. Set 'madev' to NULL.

Fixes: a69839d4327d ("net: mana: Add support for auxiliary device")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v3:
- added a "Fixes" line as suggested.
Changes in v2:
- streamlined the patch according suggestions;
- revised the description.
---
 drivers/net/ethernet/microsoft/mana/mana_en.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index d087cf954f75..608ad31a9702 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -2798,6 +2798,8 @@ static int add_adev(struct gdma_dev *gd)
 	if (ret)
 		goto init_fail;
 
+	/* madev is owned by the auxiliary device */
+	madev = NULL;
 	ret = auxiliary_device_add(adev);
 	if (ret)
 		goto add_fail;
-- 
2.25.1