[binutils-gdb] bfd_error_on_input messages

[Alan Modra <amodra@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fc998e4cb708899b5f75d8d4d2b79ed162437c41

commit fc998e4cb708899b5f75d8d4d2b79ed162437c41
Author: Alan Modra <amodra@gmail.com>
Date:   Mon Jun 5 16:25:16 2023 +0930

    bfd_error_on_input messages
    
    bfd_errmsg uses asprintf for bfd_error_on_input, which means we
    currently leak memory.  Keep a static pointer to the message and free
    it in various places to minimise the leaks.
    bfd_set_input_error (NULL, bfd_error_no_error) is a way to free up the
    last string if that matters.
    
            * bfd.c (input_error_msg): New static var.
            (bfd_set_input_error): Free it here..
            (bfd_init): ..and here..
            (bfd_errmsg): ..and here.  Use it for asprintf output.

Diff:
---
 bfd/bfd.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/bfd/bfd.c b/bfd/bfd.c
index 71debd73733..4ae73701ce1 100644
--- a/bfd/bfd.c
+++ b/bfd/bfd.c
@@ -703,8 +703,9 @@ CODE_FRAGMENT
 */
 
 static bfd_error_type bfd_error;
-static bfd *input_bfd;
 static bfd_error_type input_error;
+static bfd *input_bfd;
+static char *input_error_msg;
 
 const char *const bfd_errmsgs[] =
 {
@@ -792,6 +793,8 @@ bfd_set_input_error (bfd *input, bfd_error_type error_tag)
   /* This is an error that occurred during bfd_close when writing an
      archive, but on one of the input files.  */
   bfd_error = bfd_error_on_input;
+  free (input_error_msg);
+  input_error_msg = NULL;
   input_bfd = input;
   input_error = error_tag;
   if (input_error >= bfd_error_on_input)
@@ -818,12 +821,13 @@ bfd_errmsg (bfd_error_type error_tag)
 #endif
   if (error_tag == bfd_error_on_input)
     {
-      char *buf;
       const char *msg = bfd_errmsg (input_error);
 
-      if (asprintf (&buf, _(bfd_errmsgs [error_tag]),
+      free (input_error_msg);
+      input_error_msg = NULL;
+      if (asprintf (&input_error_msg, _(bfd_errmsgs [error_tag]),
 		    bfd_get_filename (input_bfd), msg) != -1)
-	return buf;
+	return input_error_msg;
 
       /* Ick, what to do on out of memory?  */
       return msg;
@@ -1659,6 +1663,8 @@ bfd_init (void)
 {
   bfd_error = bfd_error_no_error;
   input_bfd = NULL;
+  free (input_error_msg);
+  input_error_msg = NULL;
   input_error = bfd_error_no_error;
   _bfd_error_program_name = NULL;
   _bfd_error_internal = error_handler_fprintf;