linux-kernel - [PATCH 4.4 079/131] stm class: Do not leak the chrdev in error path

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Date:   Mon,  1 Apr 2019 19:02:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alan Cox <alan.cox@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Laurent Fert <laurent.fert@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 079/131] stm class: Do not leak the chrdev in error path

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit cbe4a61d1ddc4790d950ca8c33ef79ee68ef5e2b ]

Currently, the error path of stm_register_device() forgets to unregister
the chrdev. Fix this.

Reported-by: Alan Cox <alan.cox@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwtracing/stm/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 03b34dcff7f2..0c7f0bae001a 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -686,6 +686,8 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
 	return 0;
 
 err_device:
+	unregister_chrdev(stm->major, stm_data->name);
+
 	/* matches device_initialize() above */
 	put_device(&stm->dev);
 err_free:
-- 
2.19.1