tree b19e6bf3825cd00040df90826249a3c490a51e0a
parent 8c55dc79a79d6a16c364e6b1f849bf426f21fcbb
author Ron Yorston <rmy@pobox.com> 1446232057 +0000
committer Denys Vlasenko <vda.linux@googlemail.com> 1446240193 +0100

ash: allow popredir to be called if the stack is empty

If /tmp/test.sh is a script that tries to run a second script which
happens to be non-executable this:

   command . /tmp/test.sh

causes a seg fault.

This is because clearredir is called in the error path to clear the
stack of redirections.  The normal path then calls popredir, but popredir
fails when the stack is empty.

Reported-by: Bastian Bittorf <bittorf@bluebottle.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>