[gcc r11-3060] libbacktrace: correct memory lengths in Mach-O dsym support

[Ian Lance Taylor]

https://gcc.gnu.org/g:a8a7a97b4e62195f9f538bed37177af171e75b8b

commit r11-3060-ga8a7a97b4e62195f9f538bed37177af171e75b8b
Author: Ian Lance Taylor <iant@golang.org>
Date:   Tue Sep 8 14:50:32 2020 -0700

    libbacktrace: correct memory lengths in Mach-O dsym support
    
            * macho.c (macho_add_dsym): Make space for '/' in dsym.  Use
            correct length when freeing diralc.

Diff:
---
 libbacktrace/macho.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libbacktrace/macho.c b/libbacktrace/macho.c
index 20dd3262d58..241d54b5e5e 100644
--- a/libbacktrace/macho.c
+++ b/libbacktrace/macho.c
@@ -903,6 +903,7 @@ macho_add_dsym (struct backtrace_state *state, const char *filename,
   dsymsuffixdirlen = strlen (dsymsuffixdir);
 
   dsymlen = (dirnamelen
+	     + 1
 	     + basenamelen
 	     + dsymsuffixdirlen
 	     + basenamelen
@@ -925,7 +926,7 @@ macho_add_dsym (struct backtrace_state *state, const char *filename,
 
   if (diralc != NULL)
     {
-      backtrace_free (state, diralc, dirnamelen, error_callback, data);
+      backtrace_free (state, diralc, dirnamelen + 1, error_callback, data);
       diralc = NULL;
     }