Close the file handle before exiting the function

sandbox/linux/suid/process_util_linux.c

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The following is the C version of code from base/process_utils_linux.cc.
 // We shouldn't link against C++ code in a setuid binary.
 
 // Needed for O_DIRECTORY, must be defined before fcntl.h is included
 // (and it can be included earlier than the explicit #include below
 // in some versions of glibc).
@@ skipping 41 matching lines @@
     return false;
   }
 
   int fd = openat(dirfd, "oom_score_adj", O_WRONLY);
   if (fd < 0) {
     // We failed to open oom_score_adj, so let's try for the older
     // oom_adj file instead.
     fd = openat(dirfd, "oom_adj", O_WRONLY);
     if (fd < 0) {
       // Nope, that doesn't work either.
+      close(dirfd);
       return false;
     } else {
       // If we're using the old oom_adj file, the allowed range is now
       // [0, kMaxOldOomScore], so we scale the score.  This may result in some
       // aliasing of values, of course.
       score = score * kMaxOldOomScore / kMaxOomScore;
     }
   }
   close(dirfd);
 
   char buf[11];  // 0 <= |score| <= kMaxOomScore; using log_10(2**32) + 1 size
   snprintf(buf, sizeof(buf), "%d", score);
   size_t len = strlen(buf);
 
   ssize_t bytes_written = write(fd, buf, len);
   close(fd);
   return (bytes_written == (ssize_t)len);
 }