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egl: don't NULL deref the .get_capabilities function pointer

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One could easily introduce version 3 of the DRI2fenceExtension,
extending the struct, while not implementing the above function.

Thus we'll end up with NULL pointer, and dereferencing it won't fare
too well.

Fixes: 0201f01dc4 ("egl: add EGL_ANDROID_native_fence_sync")
Cc: Rob Clark <robclark@freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
This commit is contained in:
Emil Velikov 2017-08-07 17:23:19 +01:00 • committed by Emil Velikov
parent 10524d105d
commit f0d053cb6d
1 changed files with 2 additions and 1 deletions
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3
src/egl/drivers/dri2/egl_dri2.c
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@ -677,7 +677,8 @@ dri2_setup_screen(_EGLDisplay *disp)
disp->Extensions.KHR_wait_sync = EGL_TRUE;
if (dri2_dpy->fence->get_fence_from_cl_event)
disp->Extensions.KHR_cl_event2 = EGL_TRUE;
if (dri2_dpy->fence->base.version >= 2) {
if (dri2_dpy->fence->base.version >= 2 &&
dri2_dpy->fence->get_capabilities) {
unsigned capabilities =
dri2_dpy->fence->get_capabilities(dri2_dpy->dri_screen);
disp->Extensions.ANDROID_native_fence_sync =