dmaengine: stm32-mdma: abort resume if no ongoing transfer
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@foss.st.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231004163531.2864160-1-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1206,6 +1206,10 @@ static int stm32_mdma_resume(struct dma_chan *c)
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unsigned long flags;
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u32 status, reg;
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/* Transfer can be terminated */
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if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN))
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return -EPERM;
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hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc;
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spin_lock_irqsave(&chan->vchan.lock, flags);
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