Bug#1025066: gimp: Segmentation fault when editing a text box on the picture

[Patrik Svestka]

Hello Bernhard,

I think the text was the following [containing Czech characters]:

"Ahoj, já se jmenuji Sam a ty se jmenuješ jak?  Máš takový krásný
kožíšek, že Ti v něm musí být teď pěkně teploučko.  Ta bačkůrka v které
ležíš má stejnou barvu jako já."

When I tried again it did not crash as I have finished editing the
whole picture.

The actions taken: I have placed a text tool field over a picture
(backround) which has created its own layer (with text tool icon left
of the layer's name) where I have entered the text.  After the text
tool field was created I started typing the text and then it crashed.

Best regards,

Patrik

On Mon, 2022-12-12 at 12:03 +0100, Bernhard Übelacker wrote:
> Hello Patrik,
> I just tried to collect some information and reconstruct
> the given backtrace with some line information [1].
> 
> This gimp_text_tool_move_cursor leads to this upstream
> bug reports [2]. Unfortunately all closed without result.
> 
> There are a few more upstream reports with g_utf8_get_char [3],
> all with some non-latin characters, but all seem not
> reproducible.
> 
> @Patrik, can you provide the text you wanted to enter?
> Had it contained some "special" e.g. non-latin characters?
> When you try it again, does it crash again?
> If yes, maybe describe exactly the actions shortly before the crash?
> 
> Kind regards,
> Bernhard
> 
> 
> 
> [1]
>     #7  0x00007fbc1a3819a0 in g_utf8_get_char at
> ../../../glib/gutf8.c:336 at libglib-2.0.so.0
>     #8  0x000055928b983ae0 in gimp_text_tool_move_cursor at
> ./app/tools/gimptexttool-editor.c:900 at gimp
>     #9  0x00007fbc1a4463b0 in in g_closure_invoke at
> ../../../gobject/gclosure.c:832 at libgobject-2.0.so.0
>     #10 0x00007fbc1a459076 in signal_emit_unlocked_R at
> ../../../gobject/gsignal.c:3796 at libgobject-2.0.so.0
> 
>    
> https://sources.debian.org/src/glib2.0/2.74.2-1/glib/gutf8.c/#L336
>     335   gunichar result;
>     336   unsigned char c = (unsigned char) *p;
>     337
> 
>    
> https://sources.debian.org/src/gimp/2.10.32-1/app/tools/gimptexttool-editor.c/#L900
>     899                   if (new_index != -1 && new_index !=
> G_MAXINT &&
>     900                       g_utf8_get_char (text + new_index) ==
> word_joiner)
>     901                     {
> 
> 
> [2]
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/7019
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/4408
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/3960
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/3643
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/3460
> 
> [3]
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/6468
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/6704
>     https://gitlab.gnome.org/GNOME/gimp/-/issues/6794