[PATCH v2 1/2] driver: uio: fix possible memory leak in __uio_register_device

[Liu Jian]

'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 <liujia...@huawei.com>
Reviewed-by: Hamish Martin <hamish.mar...@alliedtelesis.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 b4ae2d9..4d20220 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -941,8 +941,10 @@ 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