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PS2 command substitution segfault


From: Jared Yanovich
Subject: PS2 command substitution segfault
Date: Thu, 17 Apr 2014 03:36:54 -0400

Hi,

  $ PS2='$(:)'
  $ cat <<EOF
  EOF
  Segmentation fault (core dumped)

diff --git a/eval.c b/eval.c
index 1f65aac..d2b452d 100644
--- a/eval.c
+++ b/eval.c
@@ -52,6 +52,7 @@ extern int subshell_environment, running_under_emacs;
 extern int last_command_exit_value, stdin_redir;
 extern int need_here_doc;
 extern int current_command_number, current_command_line_count, line_number;
+extern int last_command_line_count;
 extern int expand_aliases;
 
 #if defined (HAVE_POSIX_SIGNALS)
@@ -234,6 +235,7 @@ parse_command ()
        send_pwd_to_eterm ();   /* Yuck */
     }
 
+  last_command_line_count = current_command_line_count;
   current_command_line_count = 0;
   r = yyparse ();
 
diff --git a/parse.y b/parse.y
index 91bf3bf..d8ccd84 100644
--- a/parse.y
+++ b/parse.y
@@ -254,6 +254,8 @@ int current_command_line_count;
 /* The number of lines in a command saved while we run parse_and_execute */
 int saved_command_line_count;
 
+int last_command_line_count;
+
 /* The token that currently denotes the end of parse. */
 int shell_eof_token;
 
@@ -2044,17 +2046,21 @@ char *
 read_secondary_line (remove_quoted_newline)
      int remove_quoted_newline;
 {
+  sh_parser_state_t ps;
   char *ret;
   int n, c;
 
   prompt_string_pointer = &ps2_prompt;
-  if (SHOULD_PROMPT())
+  if (SHOULD_PROMPT()) {
+    save_parser_state (&ps);
     prompt_again ();
+    restore_parser_state (&ps);
+  }
   ret = read_a_line (remove_quoted_newline);
 #if defined (HISTORY)
   if (ret && remember_on_history && (parser_state & PST_HEREDOC))
     {
-      /* To make adding the the here-document body right, we need to rely
+      /* To make adding the here-document body right, we need to rely
         on history_delimiting_chars() returning \n for the first line of
         the here-document body and the null string for the second and
         subsequent lines, so we avoid double newlines.
@@ -2639,7 +2645,7 @@ static int esacs_needed_count;
 void
 gather_here_documents ()
 {
-  int r;
+  int save_need_here_doc, r;
 
   r = 0;
   while (need_here_doc)
@@ -5117,6 +5123,7 @@ history_delimiting_chars (line)
 static void
 prompt_again ()
 {
+  int saved_linecount, save_need_here_doc;
   char *temp_prompt;
 
   if (interactive == 0 || expanding_alias ())  /* XXX */
@@ -5128,10 +5135,17 @@ prompt_again ()
   if (!prompt_string_pointer)
     prompt_string_pointer = &ps1_prompt;
 
+  save_need_here_doc = need_here_doc;
+  saved_linecount = current_command_line_count; 
+  last_command_line_count = 0;
+
   temp_prompt = *prompt_string_pointer
                        ? decode_prompt_string (*prompt_string_pointer)
                        : (char *)NULL;
 
+  need_here_doc = save_need_here_doc;
+  current_command_line_count = last_command_line_count + saved_linecount;
+
   if (temp_prompt == 0)
     {
       temp_prompt = (char *)xmalloc (1);

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