From: Kenneth Graunke Date: Fri, 7 Jun 2019 05:17:06 +0000 (-0700) Subject: egl/x11: calloc dri2_surf so it's properly zeroed X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4e3297f7d4d87618bf896ac503e1f036a7b6befb;p=mesa.git egl/x11: calloc dri2_surf so it's properly zeroed Commit 2282ec0a refactored drawable creation across various platforms into a new dri2_create_drawable helper function. The GBM code in platform_drm.c code passed in dri2_surf->gbm_surf as the loaderPrivate, while most other backends passed in dri2_surf directly. To try and handle this, the patch checked if dri2_surf->gbm_surf was non-NULL, and if so, presumed that the caller is the DRM platform and we should use the dri2_surf->gbm_surf pointer. This worked for most platforms, which calloc their dri2_surf structure, zeroing the data. Unfortunately, platform_x11.c used malloc, leaving most of the dri2_surf as garbage. In particular, dri2_surf->gbm_surf was often non-NULL, causing dri2_create_drawable to try and use it, passing a garbage pointer to the createNewDrawable hook, usually leading to a SIGBUS or SIGSEGV when trying to dereference that bad pointer. Since most callers calloc the data, make platform_x11.c follow suit. Fixes crashes with i915_dri.so when running dEQP-GLES2. Reviewed-by: Mathias Fröhlich Reviewed-by: Tapani Pälli --- diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c index be9eb513243..a66d68ef60e 100644 --- a/src/egl/drivers/dri2/platform_x11.c +++ b/src/egl/drivers/dri2/platform_x11.c @@ -261,7 +261,7 @@ dri2_x11_create_surface(_EGLDriver *drv, _EGLDisplay *disp, EGLint type, (void) drv; - dri2_surf = malloc(sizeof *dri2_surf); + dri2_surf = calloc(1, sizeof *dri2_surf); if (!dri2_surf) { _eglError(EGL_BAD_ALLOC, "dri2_create_surface"); return NULL;