ceph: use struct_size() helper in __ceph_pool_perm_get()

Use struct_size() to calculate the number of bytes to be allocated.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 53fef258c2bc6ab961cf8fb44e59869c1a29737e..1d97a53d1b29709f69a4d9f7c5ae2e9f82fbdf7a 100644 (file)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -2145,7 +2145,7 @@ static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
        }
 
        pool_ns_len = pool_ns ? pool_ns->len : 0;
-       perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
+       perm = kmalloc(struct_size(perm, pool_ns, pool_ns_len + 1), GFP_NOFS);
        if (!perm) {
                err = -ENOMEM;
                goto out_unlock;