From: Wang Weiyang wangweiyang2@huawei.com
[ Upstream commit 02d7d89f816951e0862147d751b1150d67aaebdd ]
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: e8de370188d0 ("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 --- drivers/rapidio/devices/rio_mport_cdev.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index 01eb1a594ce6..1f4114b23f5a 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -1909,10 +1909,6 @@ 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); @@ -1931,6 +1927,9 @@ 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;