[PATCH] vhost-vdpa: fix memory leak in error path

[Li Qiang]

Free the 'page_list' when the 'npages' is zero.

Signed-off-by: Li Qiang <liq...@163.com>
---
 drivers/vhost/vdpa.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 3fab94f88894..6a9fcaf1831d 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -609,8 +609,10 @@ static int vhost_vdpa_process_iotlb_update(struct 
vhost_vdpa *v,
                gup_flags |= FOLL_WRITE;
 
        npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT;
-       if (!npages)
-               return -EINVAL;
+       if (!npages) {
+               ret = -EINVAL;
+               goto free_page;
+       }
 
        mmap_read_lock(dev->mm);
 
@@ -666,6 +668,8 @@ static int vhost_vdpa_process_iotlb_update(struct 
vhost_vdpa *v,
                atomic64_sub(npages, &dev->mm->pinned_vm);
        }
        mmap_read_unlock(dev->mm);
+
+free_page:
        free_page((unsigned long)page_list);
        return ret;
 }
-- 
2.25.1