ash: fix SEGV in forkchild (jp can be NULL). here documents were affected.

diff --git a/shell/ash.c b/shell/ash.c
index 06c4698..32c4402 100644 (file)
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -4424,7 +4424,8 @@ forkchild(struct job *jp, union node *n, int mode)
 #if JOBS
        /* For "jobs | cat" to work like in bash, we must retain list of jobs
         * in child, but we do need to remove ourself */
-       freejob(jp);
+       if (jp)
+               freejob(jp);
 #else
        for (jp = curjob; jp; jp = jp->prev_job)
                freejob(jp);