Acked-by: Jonathon Jongsma <jjongsma@xxxxxxxxxx>
On Fri, 2016-06-10 at 10:56 +0100, Frediano Ziglio wrote:
> This prevents a possible crash on windows 32 bit.
> The linkage of UnhookWindowsHookEx is WINAPI which is __stdcall while
> callback for g_clear_pointer is C. This could cause stack pointer
> corruption depending on compiler flags.
> On __stdcall linkage function change the stack pointer while returning
> from a function removing the parameters. On C linkage function leave
> the stack pointer unchanged. So if the compiler call a __stdcall
> function as a C function it expect the stack pointer to be unchanged
> causing the pointer to be inconsistent by an offset.
>
> Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
> ---
> src/spice-widget.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> Changes from v1:
> - extend commit message.
>
> diff --git a/src/spice-widget.c b/src/spice-widget.c
> index b5936bc..c528614 100644
> --- a/src/spice-widget.c
> +++ b/src/spice-widget.c
> @@ -827,7 +827,11 @@ static void try_keyboard_ungrab(SpiceDisplay *display)
> SPICE_DEBUG("ungrab keyboard");
> gdk_keyboard_ungrab(GDK_CURRENT_TIME);
> #ifdef G_OS_WIN32
> - g_clear_pointer(&d->keyboard_hook, UnhookWindowsHookEx);
> + // do not use g_clear_pointer as Windows API have different linkage
> + if (d->keyboard_hook) {
> + UnhookWindowsHookEx(d->keyboard_hook);
> + d->keyboard_hook = NULL;
> + }
> #endif
> d->keyboard_grab_active = false;
> g_signal_emit(widget, signals[SPICE_DISPLAY_KEYBOARD_GRAB], 0, false);
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