From: Ben Crocker <bcrocker@redhat.com>
Date: Thu, 22 Jun 2017 19:14:51 +0000 (-0400)
Subject: egl_dri2: swrastGetDrawableInfo: set *x, *y [v2]
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=162c42f8edde4a2c13b1eb5c0f9f0828441ed4c8;p=mesa.git

egl_dri2: swrastGetDrawableInfo: set *x, *y [v2]

In swrastGetDrawableInfo, set *x and *y, not just *w and *h;
this fixes a crash later in drisw_update_tex_buffer when the
(formerly) uninitialized x and y values are used to construct
an address in a call to llvmpipe_transfer_map.

Fixes crash in Piglit test
"spec@egl 1.4@eglcreatepbuffersurface and then glclear"
(<piglit dir>/bin/egl-create-pbuffer-surface -auto)
that occurred intermittently, e.g. when the uninitialized x and y in
drisw_update_tex_buffer just happened to contain absurd non-zero values.

v2: Initialize in case if function succeeds or fails, just like *w/*h.

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Ben Crocker <bcrocker@redhat.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
---

diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c
index 9176c8e73f2..c10cd84fce9 100644
--- a/src/egl/drivers/dri2/platform_x11.c
+++ b/src/egl/drivers/dri2/platform_x11.c
@@ -111,7 +111,7 @@ swrastGetDrawableInfo(__DRIdrawable * draw,
    xcb_get_geometry_reply_t *reply;
    xcb_generic_error_t *error;
 
-   *w = *h = 0;
+   *x = *y = *w = *h = 0;
    cookie = xcb_get_geometry (dri2_dpy->conn, dri2_surf->drawable);
    reply = xcb_get_geometry_reply (dri2_dpy->conn, cookie, &error);
    if (reply == NULL)
@@ -121,6 +121,8 @@ swrastGetDrawableInfo(__DRIdrawable * draw,
       _eglLog(_EGL_WARNING, "error in xcb_get_geometry");
       free(error);
    } else {
+      *x = reply->x;
+      *y = reply->y;
       *w = reply->width;
       *h = reply->height;
    }