lkml.org 
[lkml]   [2018]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3.18 042/105] uio: potential double frees if __uio_register_device() fails
Date
3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit f019f07ecf6a6b8bd6d7853bce70925d90af02d1 ]

The uio_unregister_device() function assumes that if "info->uio_dev" is
non-NULL that means "info" is fully allocated. Setting info->uio_de
has to be the last thing in the function.

In the current code, if request_threaded_irq() fails then we return with
info->uio_dev set to non-NULL but info is not fully allocated and it can
lead to double frees.

Fixes: beafc54c4e2f ("UIO: Add the User IO core code")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/uio/uio.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -832,8 +832,6 @@ int __uio_register_device(struct module
if (ret)
goto err_uio_dev_add_attributes;

- info->uio_dev = idev;
-
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
ret = devm_request_irq(idev->dev, info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
@@ -841,6 +839,7 @@ int __uio_register_device(struct module
goto err_request_irq;
}

+ info->uio_dev = idev;
return 0;

err_request_irq:

\
 
 \ /
  Last update: 2018-09-24 13:47    [W:0.299 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site