From: Jian Zhang <zhangjian210@huawei.com> Offering:ascend CVE: Reference: Type:feature reason: when using SDMA feature, we must using mm's pasid. Signed-off-by: Jian Zhang <zhangjian210@huawei.com> Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com> Reviewed-by: Weilong Chen <chenweilong@huawei.com> --- drivers/char/sdma.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/char/sdma.c b/drivers/char/sdma.c index 7380be992a67..7ac00804678d 100644 --- a/drivers/char/sdma.c +++ b/drivers/char/sdma.c @@ -833,7 +833,6 @@ struct file_open_data { static int __do_sdma_open(struct sdma_device *psdma_dev, struct file *file) { void *ret; - int pasid; struct file_open_data *data; data = kmalloc(sizeof(*data), GFP_KERNEL); @@ -848,7 +847,7 @@ static int __do_sdma_open(struct sdma_device *psdma_dev, struct file *file) } data->sva = ret; - data->pasid = pasid; + data->pasid = current->mm->pasid; data->psdma_dev = psdma_dev; file->private_data = data; @@ -875,8 +874,10 @@ static int sdma_core_open(struct inode *inode, struct file *file) static int sdma_dev_release(struct inode *inode, struct file *file) { - /* We don't unbind current process since other device may use it */ - kfree(file->private_data); + struct file_open_data *data = file->private_data; + + iommu_sva_unbind_device(data->sva); + kfree(data); return 0; } -- 2.17.1