linux-kernel - [PATCH 1/2] driver: uio: fix possible memory leak in __uio_register

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Message-ID: <1546952508-186003-2-git-send-email-liujian56@huawei.com>
Date:   Tue, 8 Jan 2019 21:01:47 +0800
From:   Liu Jian <liujian56@...wei.com>
To:     <gregkh@...uxfoundation.org>, <hamish.martin@...iedtelesis.co.nz>
CC:     <liujian56@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] driver: uio: fix possible memory leak in __uio_register_device

From: liujian <liujian56@...wei.com>

'idev' is malloced in __uio_register_device() and leak free it before
leaving from the uio_get_minor() error handing case, it will cause
memory leak.

Fixes: a93e7b331568 ("uio: Prevent device destruction while fds are open")
Signed-off-by: Liu Jian <liujian56@...wei.com>
Reviewed-by: Hamish Martin <hamish.martin@...iedtelesis.co.nz>
---
 drivers/uio/uio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 1313422..7280552 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -940,8 +940,10 @@ int __uio_register_device(struct module *owner,
 	atomic_set(&idev->event, 0);
 
 	ret = uio_get_minor(idev);
-	if (ret)
+	if (ret) {
+		kfree(idev);
 		return ret;
+	}
 
 	idev->dev.devt = MKDEV(uio_major, idev->minor);
 	idev->dev.class = &uio_class;
-- 
2.7.4