Clang static checker(scan-build) warning：
drivers/gpu/drm/xe/xe_hw_engine_group.c: line 134, column 2
Argument to kfree() is a constant address (18446744073709551604), which
is not memory allocated by malloc().
kfree() can only handle NULL pointers instead of negitave error codes.
When hw_engine_group_alloc() failed, there is a bad kfree call for
negitave error codes in xe_hw_engine_setup_groups().
Free 'group' when alloc_workqueue() failed in hw_engine_group_alloc(), and
remove wrong kfree() in xe_hw_engine_setup_groups() to fix this problem.
It's safe to remove these kfree() because drmm_add_action_or_reset()
can free these by calling hw_engine_group_free().
Fixes: d16ef1a18e39 ("drm/xe/exec: Switch hw engine group execution mode upon job submission")
Fixes: f784750c670f ("drm/xe/hw_engine_group: Introduce xe_hw_engine_group")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
---
v2:
- remove wrong destroy_workqueue() and kfree() in v1 patch
v1:
- https://lore.kernel.org/all/20241114063942.3448607-1-suhui@xxxxxxxxxxxx/
drivers/gpu/drm/xe/xe_hw_engine_group.c | 32 +++++++------------------
1 file changed, 9 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_hw_engine_group.c b/drivers/gpu/drm/xe/xe_hw_engine_group.c
index 82750520a90a..3bfa002734ad 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine_group.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine_group.c
@@ -58,8 +58,10 @@ hw_engine_group_alloc(struct xe_device *xe)
return ERR_PTR(-ENOMEM);
group->resume_wq = alloc_workqueue("xe-resume-lr-jobs-wq", 0, 0);
- if (!group->resume_wq)
+ if (!group->resume_wq) {
+ kfree(group);
return ERR_PTR(-ENOMEM);
+ }
init_rwsem(&group->mode_sem);
INIT_WORK(&group->resume_work, hw_engine_group_resume_lr_jobs_func);
@@ -84,25 +86,18 @@ int xe_hw_engine_setup_groups(struct xe_gt *gt)
enum xe_hw_engine_id id;
struct xe_hw_engine_group *group_rcs_ccs, *group_bcs, *group_vcs_vecs;
struct xe_device *xe = gt_to_xe(gt);
- int err;
group_rcs_ccs = hw_engine_group_alloc(xe);
- if (IS_ERR(group_rcs_ccs)) {
- err = PTR_ERR(group_rcs_ccs);
- goto err_group_rcs_ccs;
- }
+ if (IS_ERR(group_rcs_ccs))
+ return PTR_ERR(group_rcs_ccs);
group_bcs = hw_engine_group_alloc(xe);
- if (IS_ERR(group_bcs)) {
- err = PTR_ERR(group_bcs);
- goto err_group_bcs;
- }
+ if (IS_ERR(group_bcs))
+ return PTR_ERR(group_bcs);
group_vcs_vecs = hw_engine_group_alloc(xe);
- if (IS_ERR(group_vcs_vecs)) {
- err = PTR_ERR(group_vcs_vecs);
- goto err_group_vcs_vecs;
- }
+ if (IS_ERR(group_vcs_vecs))
+ return PTR_ERR(group_vcs_vecs);
for_each_hw_engine(hwe, gt, id) {
switch (hwe->class) {
@@ -125,15 +120,6 @@ int xe_hw_engine_setup_groups(struct xe_gt *gt)
}
return 0;
-
-err_group_vcs_vecs:
- kfree(group_vcs_vecs);
-err_group_bcs:
- kfree(group_bcs);
-err_group_rcs_ccs:
- kfree(group_rcs_ccs);
-
- return err;
}
/**
--
2.30.2
