dmsetup: return non-zero on stdio I/O error

If there is an I/O error on stdout or stderr, return a non-zero status so that udev can avoid trusting the values printed.
lvmteam · Apr 3, 2022 · 0cae942 · 0cae942
1 parent 8dccc23
commit 0cae942
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/libdm/dm-tools/dmsetup.c b/libdm/dm-tools/dmsetup.c
@@ -7505,5 +7505,9 @@ int main(int argc, char **argv)
  if (_initial_timestamp)
  dm_timestamp_destroy(_initial_timestamp);
 
+ fflush(stdout);
+ fflush(stderr);
+ if (ferror(stdout) || ferror(stderr))
+ return 1;
  return (_switches[HELP_ARG] || _switches[VERSION_ARG]) ? 0 : ret;
 }