From: Xin Xiong <xiongx18@xxxxxxxxxxxx> [ Upstream commit 8105c2abbf36296bf38ca44f55ee45d160db476a ] The issue happens in several error handling paths on two refcounted object related to the object "host" (dma_chan_rx, dma_chan_tx). In these paths, the function forgets to decrement one or both objects' reference count increased earlier by dma_request_chan(), causing reference count leaks. Fix it by balancing the refcounts of both objects in some error handling paths. In correspondence with the changes in moxart_probe(), IS_ERR() is replaced with IS_ERR_OR_NULL() in moxart_remove() as well. Signed-off-by: Xin Xiong <xiongx18@xxxxxxxxxxxx> Signed-off-by: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx> Signed-off-by: Xin Tan <tanxin.ctf@xxxxxxxxx> Link: https://lore.kernel.org/r/20211009041918.28419-1-xiongx18@xxxxxxxxxxxx Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/mmc/host/moxart-mmc.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c index 2e4a7c6971dc9..dcd128ecdf15b 100644 --- a/drivers/mmc/host/moxart-mmc.c +++ b/drivers/mmc/host/moxart-mmc.c @@ -624,6 +624,14 @@ static int moxart_probe(struct platform_device *pdev) ret = -EPROBE_DEFER; goto out; } + if (!IS_ERR(host->dma_chan_tx)) { + dma_release_channel(host->dma_chan_tx); + host->dma_chan_tx = NULL; + } + if (!IS_ERR(host->dma_chan_rx)) { + dma_release_channel(host->dma_chan_rx); + host->dma_chan_rx = NULL; + } dev_dbg(dev, "PIO mode transfer enabled\n"); host->have_dma = false; } else { @@ -678,6 +686,10 @@ static int moxart_probe(struct platform_device *pdev) return 0; out: + if (!IS_ERR_OR_NULL(host->dma_chan_tx)) + dma_release_channel(host->dma_chan_tx); + if (!IS_ERR_OR_NULL(host->dma_chan_rx)) + dma_release_channel(host->dma_chan_rx); if (mmc) mmc_free_host(mmc); return ret; @@ -690,9 +702,9 @@ static int moxart_remove(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, NULL); - if (!IS_ERR(host->dma_chan_tx)) + if (!IS_ERR_OR_NULL(host->dma_chan_tx)) dma_release_channel(host->dma_chan_tx); - if (!IS_ERR(host->dma_chan_rx)) + if (!IS_ERR_OR_NULL(host->dma_chan_rx)) dma_release_channel(host->dma_chan_rx); mmc_remove_host(mmc); mmc_free_host(mmc); -- 2.33.0
