linux-kernel - [PATCH] hwtracing: stm: fix possible double free in stm_register

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Message-Id: <20220418081632.35121-1-hbh25y@gmail.com>
Date:   Mon, 18 Apr 2022 16:16:32 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     alexander.shishkin@...ux.intel.com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, gregkh@...uxfoundation.org,
        mathieu.poirier@...aro.org
Cc:     linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] hwtracing: stm: fix possible double free in stm_register_device()

put_device() will call stm_device_release() to free stm when
stm_register_device() fails. So there is no need to call vfree() again.

Fix this by adding a return after put_device().

Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 drivers/hwtracing/stm/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 2712e699ba08..403b4f41bb1b 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -915,6 +915,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
 
 	/* matches device_initialize() above */
 	put_device(&stm->dev);
+	return err;
 err_free:
 	vfree(stm);
 
-- 
2.25.1