On Wednesday 21 May 2014 15:28:25 Dan Carpenter wrote:
> Hello Jonas Jensen,
>
> The patch 1b66e94e6b99: "mmc: moxart: Add MOXA ART SD/MMC driver"
> from Apr 9, 2014, leads to the following static checker warning:
>
> drivers/mmc/host/moxart-mmc.c:691 moxart_remove()
> warn: variable dereferenced before check 'mmc' (see line 687)
>
> drivers/mmc/host/moxart-mmc.c
> 684 static int moxart_remove(struct platform_device *pdev)
> 685 {
> 686 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
> 687 struct moxart_host *host = mmc_priv(mmc);
> ^^^^^^^^^^^^^
> Dereference.
>
> 688
> 689 dev_set_drvdata(&pdev->dev, NULL);
> 690
> 691 if (mmc) {
> ^^^
> Check.
Right, the check should just be removed, because the moxart_remove
function will not be called unless moxart_probe() has successfully
set the drvdata.
On a related note, I also found two bugs using automated build testing:
a) The driver should use dma_request_slave_channel_reason() instead of
of_dma_request_slave_channel() so it can be compiled when CONFIG_OF is
disabled.
b) moxart_remove() contains an extraneous kfree(host), where host is
a variable that has already been freed at that point.
Arnd
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