On Tue, May 02, 2017 at 02:01:28PM +0200, Arnd Bergmann wrote:
> On Tue, May 2, 2017 at 1:15 PM, Simon Horman <horms+renesas@xxxxxxxxxxxx> wrote:
>
> > @@ -202,6 +214,15 @@ void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
> > void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
> > irqreturn_t tmio_mmc_irq(int irq, void *devid);
> >
> > +#if IS_ENABLED(CONFIG_MMC_SDHI)
> > +const struct tmio_mmc_dma_ops *tmio_mmc_get_dma_ops(void);
> > +#else
> > +static inline const struct tmio_mmc_dma_ops *tmio_mmc_get_dma_ops(void)
> > +{
> > + return NULL;
> > +}
> > +#endif
> > +
> > static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
> > unsigned long *flags)
> > {
>
> Here you return a NULL pointer for the operations structure
>
> > +
> > +static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
> > +{
> > + if (host->dma_ops->enable)
> > + host->dma_ops->enable(host, enable);
> > +}
> >
>
> And here you check the ->enable callback but not the dma_ops pointer.
> In the other callbacks you check the dma_ops pointer but not the callback.
> Is that intentional? Maybe always check the dma_ops pointer first for
> consistency, as a NULL operations structure (resulting from a future bug)
> might lead running user space with kernel privileges.
Thanks for noticing.
I resolved that problem but it seems to have crept back in again.
I'll check to see how that happened.
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