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rapidio: fix possible UAF when kfifo_alloc() fails 

[ Upstream commit 02d7d89f81 ]

If kfifo_alloc() fails in mport_cdev_open(), goto err_fifo and just free
priv. But priv is still in the chdev->file_list, then list traversal
may cause UAF. This fixes the following smatch warning:

drivers/rapidio/devices/rio_mport_cdev.c:1930 mport_cdev_open() warn: '&priv->list' not removed from list

Link: https://lkml.kernel.org/r/20221123095147.52408-1-wangweiyang2@huawei.com
Fixes: e8de370188 ("rapidio: add mport char device driver")
Signed-off-by: Wang Weiyang <wangweiyang2@huawei.com>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Jakob Koschel <jakobkoschel@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wang Weiyang 2022-11-23 17:51:47 +08:00 committed by Greg Kroah-Hartman
parent 337b68da68
commit 2f5cc7fd73
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/rapidio/devices/rio_mport_cdev.c
View File

@ -1903,10 +1903,6 @@ static int mport_cdev_open(struct inode *inode, struct file *filp)
priv->md = chdev;
mutex_lock(&chdev->file_mutex);
list_add_tail(&priv->list, &chdev->file_list);
mutex_unlock(&chdev->file_mutex);
INIT_LIST_HEAD(&priv->db_filters);
INIT_LIST_HEAD(&priv->pw_filters);
spin_lock_init(&priv->fifo_lock);
@ -1925,6 +1921,9 @@ static int mport_cdev_open(struct inode *inode, struct file *filp)
spin_lock_init(&priv->req_lock);
mutex_init(&priv->dma_lock);
#endif
mutex_lock(&chdev->file_mutex);
list_add_tail(&priv->list, &chdev->file_list);
mutex_unlock(&chdev->file_mutex);
filp->private_data = priv;
goto out;