eval: avoid leaking memory associated with redirections

The following constructs result in ever-increasing memory usage:

  while true; do { true; } </dev/null; done
  while true; do ( true; ) </dev/null; done

For comparison, bash displays static memory usage in both cases.

This issue was reported for BusyBox ash which is derived from dash:

  https://bugs.busybox.net/show_bug.cgi?id=7748

Signed-off-by: Ron Yorston <rmy@frippery.org>

I have simplified evaltree so that it simply sets the stack mark
unconditionally.  This allows us to remove the stack marks in the
functions called by evaltree.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

0 files changed, 0 insertions, 0 deletions