Thanks Rob for finding this one.
Reviewed-by: Deepak Rawat drawat@vmware.com
From: dri-devel [mailto:dri-devel-bounces@lists.freedesktop.org] On Behalf Of Rob Clark Sent: Wednesday, January 17, 2018 7:16 AM To: dri-devel@lists.freedesktop.org Cc: Thomas Hellstrom thellstrom@vmware.com; Rob Clark rclark@redhat.com; David Airlie airlied@linux.ie; linux- kernel@vger.kernel.org; stable@vger.kernel.org; linux-graphics-maintainer linux-graphics-maintainer@vmware.com Subject: [PATCH] drm/vmwgfx: fix memory corruption with legacy/sou connectors
From: Rob Clark rclark@redhat.com
It looks like in all cases 'struct vmw_connector_state' is used. But only in stdu connectors, was atomic_{duplicate,destroy}_state() properly subclassed. Leading to writes beyond the end of the allocated connector state block and all sorts of fun memory corruption related crashes.
Fixes: d7721ca71126 "drm/vmwgfx: Connector atomic state" Cc: stable@vger.kernel.org Signed-off-by: Rob Clark rclark@redhat.com
drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c | 4 ++-- drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c index b8a09807c5de..3824595fece1 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c @@ -266,8 +266,8 @@ static const struct drm_connector_funcs vmw_legacy_connector_funcs = { .set_property = vmw_du_connector_set_property, .destroy = vmw_ldu_connector_destroy, .reset = vmw_du_connector_reset,
- .atomic_duplicate_state =
drm_atomic_helper_connector_duplicate_state,
- .atomic_destroy_state =
drm_atomic_helper_connector_destroy_state,
- .atomic_duplicate_state = vmw_du_connector_duplicate_state,
- .atomic_destroy_state = vmw_du_connector_destroy_state, .atomic_set_property = vmw_du_connector_atomic_set_property, .atomic_get_property = vmw_du_connector_atomic_get_property,
}; diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c index bc5f6026573d..63a4cd794b73 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c @@ -420,8 +420,8 @@ static const struct drm_connector_funcs vmw_sou_connector_funcs = { .set_property = vmw_du_connector_set_property, .destroy = vmw_sou_connector_destroy, .reset = vmw_du_connector_reset,
- .atomic_duplicate_state =
drm_atomic_helper_connector_duplicate_state,
- .atomic_destroy_state =
drm_atomic_helper_connector_destroy_state,
- .atomic_duplicate_state = vmw_du_connector_duplicate_state,
- .atomic_destroy_state = vmw_du_connector_destroy_state, .atomic_set_property = vmw_du_connector_atomic_set_property, .atomic_get_property = vmw_du_connector_atomic_get_property,
};
2.14.3
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