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[lts-9.4] CVE-2025-38211 #703

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Merged
merged 3 commits into from
Nov 18, 2025
Merged

[lts-9.4] CVE-2025-38211 #703

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30dd388
RDMA/iwcm: Fix a use-after-free related to destroying CM IDs
roxanan1996 Nov 14, 2025
261d05c
RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency
roxanan1996 Nov 14, 2025
4448675
RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction
roxanan1996 Nov 14, 2025
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24 changes: 14 additions & 10 deletions drivers/infiniband/core/iwcm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -367,8 +367,7 @@ EXPORT_SYMBOL(iw_cm_disconnect);
/*
* CM_ID <-- DESTROYING
*
* Clean up all resources associated with the connection and release
* the initial reference taken by iw_create_cm_id.
* Clean up all resources associated with the connection.
*/
static void destroy_cm_id(struct iw_cm_id *cm_id)
{
Expand Down Expand Up @@ -439,19 +438,22 @@ static void destroy_cm_id(struct iw_cm_id *cm_id)
iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
}

(void)iwcm_deref_id(cm_id_priv);
}

/*
* This function is only called by the application thread and cannot
* be called by the event thread. The function will wait for all
* references to be released on the cm_id and then kfree the cm_id
* object.
* Destroy cm_id. If the cm_id still has other references, wait for all
* references to be released on the cm_id and then release the initial
* reference taken by iw_create_cm_id.
*/
void iw_destroy_cm_id(struct iw_cm_id *cm_id)
{
struct iwcm_id_private *cm_id_priv;

cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
destroy_cm_id(cm_id);
if (refcount_read(&cm_id_priv->refcount) > 1)
flush_workqueue(iwcm_wq);
iwcm_deref_id(cm_id_priv);
}
EXPORT_SYMBOL(iw_destroy_cm_id);

Expand Down Expand Up @@ -1034,8 +1036,10 @@ static void cm_work_handler(struct work_struct *_work)

if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
ret = process_event(cm_id_priv, &levent);
if (ret)
if (ret) {
destroy_cm_id(&cm_id_priv->id);
WARN_ON_ONCE(iwcm_deref_id(cm_id_priv));
}
} else
pr_debug("dropping event %d\n", levent.event);
if (iwcm_deref_id(cm_id_priv))
Expand Down Expand Up @@ -1188,7 +1192,7 @@ static int __init iw_cm_init(void)
if (ret)
return ret;

iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", WQ_MEM_RECLAIM);
if (!iwcm_wq)
goto err_alloc;

Expand Down