hidma_ll_init() allocates a handoff FIFO, but the matching hidma_ll_uninit() function (which is invoked in remove()) never releases it, leaking memory.
To fix this call kfifo_free in hidma_ll_uninit().
Fixes: d1615ca2e085 ("dmaengine: qcom_hidma: implement lower level hardware interface") Cc: stable@vger.kernel.org Signed-off-by: Qasim Ijaz qasdev00@gmail.com
--- drivers/dma/qcom/hidma_ll.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c index fee448499777..0c2bae46746c 100644 --- a/drivers/dma/qcom/hidma_ll.c +++ b/drivers/dma/qcom/hidma_ll.c @@ -816,6 +816,7 @@ int hidma_ll_uninit(struct hidma_lldev *lldev)
required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres; tasklet_kill(&lldev->task); + kfifo_free(&lldev->handoff_fifo); memset(lldev->trepool, 0, required_bytes); lldev->trepool = NULL; atomic_set(&lldev->pending_tre_count, 0);
On 6/2/25 01:42, Qasim Ijaz wrote:
hidma_ll_init() allocates a handoff FIFO, but the matching hidma_ll_uninit() function (which is invoked in remove()) never releases it, leaking memory.
To fix this call kfifo_free in hidma_ll_uninit().
Fixes: d1615ca2e085 ("dmaengine: qcom_hidma: implement lower level hardware interface") Cc: stable@vger.kernel.org Signed-off-by: Qasim Ijaz qasdev00@gmail.com
drivers/dma/qcom/hidma_ll.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c index fee448499777..0c2bae46746c 100644 --- a/drivers/dma/qcom/hidma_ll.c +++ b/drivers/dma/qcom/hidma_ll.c @@ -816,6 +816,7 @@ int hidma_ll_uninit(struct hidma_lldev *lldev) required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres; tasklet_kill(&lldev->task);
- kfifo_free(&lldev->handoff_fifo); memset(lldev->trepool, 0, required_bytes); lldev->trepool = NULL; atomic_set(&lldev->pending_tre_count, 0);
Is it possible that the handoff_fifo is freed, then we could observe reset complete interrupts before they are being cleared in hidma_ll_uninit later on, which would lead to the following call chain
hidma_ll_inthandler - hidma_ll_int_handler_internal - hidma_handle_tre_completion - hidma_post_completed - tasklet_schedule(&lldev->task); - hidma_ll_tre_complete - kfifo_out
?
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