Tweak sys_openat

b27ae5e9 · Silas Boyd-Wickizer · dd3aba4e · b27ae5e9
--- a/kernel/sysfile.cc
+++ b/kernel/sysfile.cc
@@ -275,9 +275,8 @@ sys_openat(int dirfd, const char *path, int omode)
  if (dirfd == AT_FDCWD) {
    cwd = myproc()->cwd;
-  } else if (dirfd < 0 || dirfd >= NOFILE) {
-    return -1;
  } else {
+    // XXX(sbw) do we need the sref while we touch fdir->ip?
    sref<file> fdir;
    if (!getfile(dirfd, &fdir) || fdir->type != file::FD_INODE)
      return -1;