Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Problem reported upstream at
http://www.zsh.org/mla/users/2016/msg00710.html

  A possible patch has been reported upstream as
well:

---8<---
$ gendiff zsh-5.0.2 .orig
diff -up zsh-5.0.2/Src/exec.c.orig zsh-5.0.2/Src/exec.c
--- zsh-5.0.2/Src/exec.c.orig	2016-09-06 15:10:19.394565181 -0300
+++ zsh-5.0.2/Src/exec.c	2016-09-06 15:10:36.300551444 -0300
@@ -3631,16 +3631,16 @@ gethere(char **strp, int typ)
 	*bptr++ = '\n';
     }
     *t = '\0';
+    s = dupstring(buf);
+    zfree(buf, bsiz);
     if (!qt) {
 	int ef = errflag;
 
-	parsestr(buf);
+	parsestr(s);
 
 	if (!errflag)
 	    errflag = ef;
     }
-    s = dupstring(buf);
-    zfree(buf, bsiz);
     return s;
 }
 
---8<---

  The problem is caused by mixing system malloc data
and internal zsh allocator. It does not find the Heap
associated with the pointer passed to hrealloc and
crashes when dereferencing a null pointer.

  Simple reproducer:
---8<---
#!/usr/bin/zsh

cat >> /tmp/try <<EOF
export A="$(tr '\n' ' ' <<BLDARC
content
BLDARC)"
EOF
---8<---

Thank you for reporting the bug!

Next time please remember to report the exact NVR (Name-Version-Release) of the package you tested it with.

This bug seems to be already fixed upstream:
https://sourceforge.net/p/zsh/code/ci/c6c9f5da

Clearing the needinfo flag.  The answer is available in bug #1431068 comment #2.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1955