[PATCH AUTOSEL 4.14 071/371] driver: uio: fix possible memory leak in __uio_register_device

Sasha Levin
2020-01-16T17:24:28Z

From: Liu Jian <liujian56@huawei.com>

[ Upstream commit 1a392b3de7c5747506b38fc14b2e79977d3c7770 ]

'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@huawei.com>
Reviewed-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 fb5c9701b1fb..4e9b0ff79b13 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -939,8 +939,10 @@ 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;
--
2.20.1