drm/xe: prevent potential UAF in pf_provision_vf_ggtt()

The node ptr can point to an already freed ptr, if we hit the path with
an already allocated node. We later dereference that pointer with:

	xe_gt_assert(gt, !xe_ggtt_node_allocated(node));

which is a potential UAF. Fix this by not stashing the ptr for node.
Also since it is likely a bad idea to leave config->ggtt_region pointing
to a stale ptr, also set that to NULL by calling
pf_release_vf_config_ggtt() instead of pf_release_ggtt().

Fixes: 34e804220f69 ("drm/xe: Make xe_ggtt_node struct independent")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 89076b5a8b4e0a01040585e156a0b014cd472fd3)
Signed-off-by: Lucas De Marchi <[email protected]>

0 files changed, 0 insertions, 0 deletions