[PATCHv4 06/15] dmaengine: fsldma: fix probe error path not freeing IRQs

[Rosen Penev]

If dma_async_device_register() fails after fsldma_request_irqs()
succeeded, the error path jumped to out_free_fdev which only removed
channels but never freed the already-registered IRQs.  A subsequent
interrupt would access freed memory.

Fix by adding an out_free_irqs label that calls fsldma_free_irqs()
before falling through to the existing channel cleanup.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/dma/fsldma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 3009e1531292..4475d50a94f5 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1306,10 +1306,12 @@ static int fsldma_of_probe(struct platform_device *op)
 	err = dma_async_device_register(&fdev->common);
 	if (err) {
 		dev_err(fdev->dev, "unable to register DMA device\n");
-		goto out_free_fdev;
+		goto out_free_irqs;
 	}
 	return 0;
 
+out_free_irqs:
+	fsldma_free_irqs(fdev);
 out_free_fdev:
 	for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) {
 		if (fdev->chan[i])
-- 
2.54.0