[PATCH 4.19 20/98] dmaengine: stm32-mdma: abort resume if no ongoing transfer

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>

commit 81337b9a72dc58a5fa0ae8a042e8cb59f9bdec4a upstream.

chan->desc can be null, if transfer is terminated when resume is called,
leading to a NULL pointer when retrieving the hwdesc.
To avoid this case, check that chan->desc is not null and channel is
disabled (transfer previously paused or terminated).

Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20231004163531.2864160-1-amelie.delaunay@xxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/dma/stm32-mdma.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1217,6 +1217,10 @@ static int stm32_mdma_resume(struct dma_
 	unsigned long flags;
 	u32 status, reg;
 
+	/* Transfer can be terminated */
+	if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN))
+		return -EPERM;
+
 	hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
 
 	spin_lock_irqsave(&chan->vchan.lock, flags);





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