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dmaengine: qcom: hidma_mgmt: Add of_node_put() before goto 

Each iteration of for_each_available_child_of_node puts the previous
node, but in the case of a goto from the middle of the loop, there is
no put, thus causing a memory leak.
Hence add an of_node_put under the label that the gotos point to.
In order to avoid decrementing an already-decremented refcount, copy the
original contents of the label (including the return statement) to just
above the label, so that the code under the label is executed only when
a goto exit from the loop occurs.
Additionally, remove an unnecessary get/put pair from the loop, as the
loop itself already keeps track of refcount.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Acked-by: Sinan Kaya <okaya@kernel.org>
Link: https://lore.kernel.org/r/20190724081609.9724-1-nishkadg.linux@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Nishka Dasgupta 2019-07-24 13:46:09 +05:30 committed by Vinod Koul
parent 232a7f18cf
commit 057b05d5ac
1 changed files with 6 additions and 2 deletions
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8
drivers/dma/qcom/hidma_mgmt.c
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@ -387,7 +387,6 @@ static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
ret = PTR_ERR(new_pdev);
goto out;
}
of_node_get(child);
new_pdev->dev.of_node = child;
of_dma_configure(&new_pdev->dev, child, true);
/*
@ -395,9 +394,14 @@ static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
* platforms with or without MSI support.
*/
of_msi_configure(&new_pdev->dev, child);
of_node_put(child);
}
kfree(res);
return ret;
out:
of_node_put(child);
kfree(res);
return ret;