Merge tag 'seccomp-v4.16-rc3' of https://git.kernel.org/pub/scm/linux/kernel/git...
[muen/linux.git] / kernel / seccomp.c
index 940fa408a288f778fed1e61fa004cbf6e8fdac75..dc77548167ef0993487a61bcf6cbbabb2f6f2434 100644 (file)
@@ -1076,14 +1076,16 @@ long seccomp_get_metadata(struct task_struct *task,
 
        size = min_t(unsigned long, size, sizeof(kmd));
 
-       if (copy_from_user(&kmd, data, size))
+       if (size < sizeof(kmd.filter_off))
+               return -EINVAL;
+
+       if (copy_from_user(&kmd.filter_off, data, sizeof(kmd.filter_off)))
                return -EFAULT;
 
        filter = get_nth_filter(task, kmd.filter_off);
        if (IS_ERR(filter))
                return PTR_ERR(filter);
 
-       memset(&kmd, 0, sizeof(kmd));
        if (filter->log)
                kmd.flags |= SECCOMP_FILTER_FLAG_LOG;