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drm/xe: prevent potential UAF in pf_provision_vf_ggtt()

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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: 34e804220f ("drm/xe: Make xe_ggtt_node struct independent")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240828104341.180111-2-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2024-08-28 11:43:42 +01:00
parent cd89de14bb
commit 89076b5a8b
1 changed files with 4 additions and 4 deletions
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8
drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c
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@ -399,7 +399,7 @@ static void pf_release_vf_config_ggtt(struct xe_gt *gt, struct xe_gt_sriov_confi
static int pf_provision_vf_ggtt(struct xe_gt *gt, unsigned int vfid, u64 size)
{
struct xe_gt_sriov_config *config = pf_pick_vf_config(gt, vfid);
struct xe_ggtt_node *node = config->ggtt_region;
struct xe_ggtt_node *node;
struct xe_tile *tile = gt_to_tile(gt);
struct xe_ggtt *ggtt = tile->mem.ggtt;
u64 alignment = pf_get_ggtt_alignment(gt);
@ -411,14 +411,14 @@ static int pf_provision_vf_ggtt(struct xe_gt *gt, unsigned int vfid, u64 size)
size = round_up(size, alignment);
if (xe_ggtt_node_allocated(node)) {
if (xe_ggtt_node_allocated(config->ggtt_region)) {
err = pf_distribute_config_ggtt(tile, vfid, 0, 0);
if (unlikely(err))
return err;
pf_release_ggtt(tile, node);
pf_release_vf_config_ggtt(gt, config);
}
xe_gt_assert(gt, !xe_ggtt_node_allocated(node));
xe_gt_assert(gt, !xe_ggtt_node_allocated(config->ggtt_region));
if (!size)
return 0;