egl/drm: Set disp->DriverData to NULL on error

Avoid use-after-free on error.

Fixes: 9ee683f877 (egl/dri2: Add reference count for dri2_egl_display)
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Martin Peres <martin.peres@linux.intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit a9e8fb73977beaa407b72c4843e75db3b186ea09)

diff --git a/src/egl/drivers/dri2/platform_drm.c b/src/egl/drivers/dri2/platform_drm.c
index 9373496..1ce282f 100644 (file)
--- a/src/egl/drivers/dri2/platform_drm.c
+++ b/src/egl/drivers/dri2/platform_drm.c
@@ -726,5 +726,6 @@ cleanup:
       close(fd);
 
    free(dri2_dpy);
+   disp->DriverData = NULL;
    return EGL_FALSE;
 }