Use xstrdup in tui_set_source_content

valgrind pointed out that the string copy in tui_set_source_content
was not allocating space for the trailing \0:

==3941== Invalid write of size 1
==3941==    at 0x4C3239F: strcpy (vg_replace_strmem.c:512)
==3941==    by 0x72036B: strcpy (string_fortified.h:90)
==3941==    by 0x72036B: tui_set_source_content(symtab*, int, int) (tui-source.c:203)

Looking closer, I don't think there's a need to check the line width
here, so this patch changes it to use xstrdup.

Tested by re-running the TUI under valgrind.  There are still other
valgrind reports from TUI code, but this one is gone.

gdb/ChangeLog
2019-01-03  Tom Tromey  <tom@tromey.com>

	* tui/tui-source.c (tui_set_source_content): Use xstrdup.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2292eaa..305eb7a 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,9 @@
 2019-01-03  Tom Tromey  <tom@tromey.com>
 
+       * tui/tui-source.c (tui_set_source_content): Use xstrdup.
+
+2019-01-03  Tom Tromey  <tom@tromey.com>
+
        * python/py-symtab.c (salpy_str): Update.
        (struct salpy_sal_object) <symtab>: Now a PyObject.
        (salpy_dealloc): Update.

diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index 9c2a982..ed9562a 100644 (file)
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -194,15 +194,9 @@ tui_set_source_content (struct symtab *s,
 
                  xfree (TUI_SRC_WIN->generic.content[cur_line]
                         ->which_element.source.line);
-                 int alloc_len = text.size ();
-                 if (alloc_len < line_width)
-                   alloc_len = line_width + 1;
                  TUI_SRC_WIN->generic.content[cur_line]
                    ->which_element.source.line
-                   = (char *) xmalloc (alloc_len);
-                 strcpy (TUI_SRC_WIN->generic.content[cur_line]
-                         ->which_element.source.line,
-                         text.c_str ());
+                   = xstrdup (text.c_str ());
 
                  cur_line++;
                  cur_line_no++;