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modesetting: Set correct DRM event context version

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DRM_EVENT_CONTEXT_VERSION is the latest context version supported by
whatever version of libdrm is present. modesetting was blindly asserting
it supported whatever version that may be, even if it actually didn't.

With libdrm 2.4.78, setting a higher context version than 2 will attempt
to call the page_flip_handler2 vfunc if it was non-NULL, which being a
random chunk of stack memory, it might well have been.

Set the version as 2, which should be bumped only with the appropriate
version checks.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Daniel Stone 2017-04-07 14:27:58 +01:00 committed by Adam Jackson
parent e4d0757fc2
commit 0c8e6ed858
1 changed files with 1 additions and 1 deletions
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2
hw/xfree86/drivers/modesetting/vblank.c
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@ -402,7 +402,7 @@ ms_vblank_screen_init(ScreenPtr screen)
modesettingEntPtr ms_ent = ms_ent_priv(scrn);
xorg_list_init(&ms_drm_queue);
ms->event_context.version = DRM_EVENT_CONTEXT_VERSION;
ms->event_context.version = 2;
ms->event_context.vblank_handler = ms_drm_handler;
ms->event_context.page_flip_handler = ms_drm_handler;