Convert vhost to struct_size

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 895eaa2..f9bce81 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1286,7 +1286,8 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
                return -EOPNOTSUPP;
        if (mem.nregions > max_mem_regions)
                return -E2BIG;
-       newmem = kvzalloc(size + mem.nregions * sizeof(*m->regions), GFP_KERNEL);
+       newmem = kvzalloc(struct_size(newmem, regions, mem.nregions),
+                       GFP_KERNEL);
        if (!newmem)
                return -ENOMEM;