https://savannah.gnu.org/bugs/?36451

From a95796de3a491d8acfc8ea94c217b90531161786 Mon Sep 17 00:00:00 2001
From: psmith <psmith>
Date: Sun, 9 Sep 2012 23:25:07 +0000
Subject: [PATCH] Keep the command line on the heap to avoid stack overflow.
 Fixes Savannah bug #36451.

---
 ChangeLog |  3 +++
 job.c     | 13 +++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/job.c b/job.c
index 754576b..f7b7d51 100644
--- a/job.c
+++ b/job.c
@@ -2984,8 +2984,8 @@ construct_command_argv_internal (char *line, char **restp, char *shell,
 	return new_argv;
       }
 
-    new_line = alloca ((shell_len*2) + 1 + sflags_len + 1
-                             + (line_len*2) + 1);
+    new_line = xmalloc ((shell_len*2) + 1 + sflags_len + 1
+                        + (line_len*2) + 1);
     ap = new_line;
     /* Copy SHELL, escaping any characters special to the shell.  If
        we don't escape them, construct_command_argv_internal will
@@ -3052,8 +3052,11 @@ construct_command_argv_internal (char *line, char **restp, char *shell,
 	*ap++ = *p;
       }
     if (ap == new_line + shell_len + sflags_len + 2)
-      /* Line was empty.  */
-      return 0;
+      {
+        /* Line was empty.  */
+        free (new_line);
+        return 0;
+      }
     *ap = '\0';
 
 #ifdef WINDOWS32
@@ -3194,6 +3197,8 @@ construct_command_argv_internal (char *line, char **restp, char *shell,
       fatal (NILF, _("%s (line %d) Bad shell context (!unixy && !batch_mode_shell)\n"),
             __FILE__, __LINE__);
 #endif
+
+    free (new_line);
   }
 #endif	/* ! AMIGA */
 
-- 
1.7.12