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chain-dma: fix NULL dereference #11016

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chain-dma: fix NULL dereference #11016

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4 changes: 2 additions & 2 deletions src/schedule/zephyr_ll.c
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@ static void zephyr_ll_task_done(struct zephyr_ll *sch,

task->state = SOF_TASK_STATE_FREE;

if (pdata->freeing)
if (pdata && pdata->freeing)

@ujfalusi ujfalusi Jul 22, 2026

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The real issue is with the 48cdc4d + CONFIG_USERSPACE=y
this combination causes the ChainDMA crash on PTL and only on PTL as CONFIG_USERSPACE=y is only set for PTL, all other platform has USERSPACE disabled.
it boils down to some difference due to the use of kernel/sys/sem.c vs kernel/userspace/sem.c for semaphore.

Reverting the commit or disabling USERSPACE fixed the crash on PTL.

/*
* zephyr_ll_task_free() is trying to free this task. Complete
* it and signal the semaphore to let the function proceed
Expand Down Expand Up @@ -258,7 +258,7 @@ static void zephyr_ll_run(void *data)
task = container_of(list, struct task, list);
pdata = task->priv_data;

if (task->state == SOF_TASK_STATE_CANCEL) {
if (!pdata || task->state == SOF_TASK_STATE_CANCEL) {
list = list->next;
zephyr_ll_task_done(sch, task);
continue;
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