launch: Avoid double-close when qemu exits early.

The stdin and stdout of the qemu process are aliased to g->fd:

  g->fd[0] = wfd[1];
  g->fd[1] = rfd[0];

However if the child exits early, then child_cleanup closes g->fd[0],
g->fd[1], AND the code at the cleanup1 label closes wfd[1], rfd[0],
resulting in a double-close.

Avoid this case by setting wfd[1], rfd[0] to -1.  In the cleanup1
label, only close wfd[1], rfd[0] if they are not -1, and add the same
for g->fd[0], g->fd[1].
(cherry picked from commit c87956837e962072fff61edef5b18e55ad42d730)

0 files changed, 0 insertions, 0 deletions