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| author |   Matthew Auld <matthew.auld@intel.com> | 2024-08-28 11:43:42 +0100 |
|---|---|---|
| committer |   Lucas De Marchi <lucas.demarchi@intel.com> | 2024-09-12 12:29:30 -0500 |
| commit | 83dcf232cc7919725a331359a300fb3929651b6e (patch) | |
| tree | 0a73f30db4a8f61f26ac2903854f839bf2a6b617 | |
| parent | Merge v6.11-rc7 into drm-next (diff) | |
| download | wireguard-linux-83dcf232cc7919725a331359a300fb3929651b6e.tar.xz wireguard-linux-83dcf232cc7919725a331359a300fb3929651b6e.zip | |
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 <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
(cherry picked from commit 89076b5a8b4e0a01040585e156a0b014cd472fd3)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c index a95e546b7744..8250ef71e685 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c @@ -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; |