From 72a90102d5f510e3635007bb761d5f9857888831 Mon Sep 17 00:00:00 2001 From: Chad Versace Date: Tue, 23 Apr 2013 04:17:48 +0200 Subject: [PATCH] egl/dri2: Fix min/max swap interval of configs The commit below exposed a bug in dri2_add_config. commit 3998f8c6b5da1a223926249755e54d8f701f81ab Author: Ralf Jung Date: Tue Apr 9 14:09:50 2013 +0200 egl/x11: Fix initialisation of swap_interval This little code snippet near the bottom of dri2_add_config, if (double_buffer) { ... conf->base.MinSwapInterval = dri2_dpy->min_swap_interval; conf->base.MaxSwapInterval = dri2_dpy->max_swap_interval; } it never did what it claimed to do. The assignment never changed the value of conf->base.MaxSwapInterval, because dri2_dpy->max_swap_interval was, until the above exposing commit, unitialized here. That is, conf->base.MaxSwapInterval was 0 before and after assignment. Ditto for the min swap interval. Above the troublesome code snippet, the call to _eglFilterArray rejects the config as unmatching if its swap interval bounds differ from the base config's. Before the exposing commit, at the call to _eglFilterArray, the swap interval bounds were always [0,0], and hence no config was rejected due to swap interval. After the exposing commit, _eglFilterArray incorrectly rejected some configs, which prevented dri2_egl_config::dri_double_config from getting set for the rejected config, which resulted in a NULL pointer getting passed into dri2CreateNewDrawable, and then segfault. The solution: set the swap interval bounds before _eglFilterArray. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63447 Signed-off-by: Chad Versace --- src/egl/drivers/dri2/egl_dri2.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c index 06a21d7..1011f27 100644 --- a/src/egl/drivers/dri2/egl_dri2.c +++ b/src/egl/drivers/dri2/egl_dri2.c @@ -221,6 +221,9 @@ dri2_add_config(_EGLDisplay *disp, const __DRIconfig *dri_config, int id, base.RenderableType = disp->ClientAPIs; base.Conformant = disp->ClientAPIs; + base.MinSwapInterval = dri2_dpy->min_swap_interval; + base.MaxSwapInterval = dri2_dpy->max_swap_interval; + if (!_eglValidateConfig(&base, EGL_FALSE)) { _eglLog(_EGL_DEBUG, "DRI2: failed to validate config %d", id); return NULL; @@ -268,9 +271,6 @@ dri2_add_config(_EGLDisplay *disp, const __DRIconfig *dri_config, int id, if (double_buffer) { surface_type &= ~EGL_PIXMAP_BIT; - - conf->base.MinSwapInterval = dri2_dpy->min_swap_interval; - conf->base.MaxSwapInterval = dri2_dpy->max_swap_interval; } conf->base.SurfaceType |= surface_type; -- 1.8.1.4