>-----Original Message----- >From: Javier Martinez Canillas [mailto:javierm@xxxxxxxxxx] >Sent: Wednesday, December 20, 2017 3:36 AM >To: linux-kernel@xxxxxxxxxxxxxxx >Cc: James Ettle <james@xxxxxxxxxxxx>; Hans de Goede ><hdegoede@xxxxxxxxxx>; Shaikh, Azhar <azhar.shaikh@xxxxxxxxx>; Javier >Martinez Canillas <javierm@xxxxxxxxxx>; Arnd Bergmann <arnd@xxxxxxxx>; >Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>; Peter Huewe ><peterhuewe@xxxxxx>; Jason Gunthorpe <jgg@xxxxxxxx>; Greg Kroah- >Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>; linux-integrity@xxxxxxxxxxxxxxx >Subject: [PATCH 1/4] tpm: fix access attempt to an already unmapped I/O >memory region > >The driver maps the I/O memory address to control the LPC bus CLKRUN_EN, >but on the error path the memory is accessed by the .clk_enable handler after >this was already unmapped. So only unmap the I/O memory region if it will >not be used anymore. > >Also, the correct thing to do is to cleanup the resources in the inverse order >that were acquired to prevent issues like these. > Thanks for catching this! >Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx> >--- > > drivers/char/tpm/tpm_tis_core.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > >diff --git a/drivers/char/tpm/tpm_tis_core.c >b/drivers/char/tpm/tpm_tis_core.c index c2227983ed88..3455abbb2035 >100644 >--- a/drivers/char/tpm/tpm_tis_core.c >+++ b/drivers/char/tpm/tpm_tis_core.c >@@ -923,7 +923,7 @@ int tpm_tis_core_init(struct device *dev, struct >tpm_tis_data *priv, int irq, > > rc = tpm_chip_register(chip); > if (rc && is_bsw()) >- iounmap(priv->ilb_base_addr); >+ goto out_err; > > if (chip->ops->clk_enable != NULL) > chip->ops->clk_enable(chip, false); >@@ -931,12 +931,13 @@ int tpm_tis_core_init(struct device *dev, struct >tpm_tis_data *priv, int irq, > return rc; > out_err: > tpm_tis_remove(chip); >- if (is_bsw()) >- iounmap(priv->ilb_base_addr); > > if (chip->ops->clk_enable != NULL) > chip->ops->clk_enable(chip, false); > >+ if (is_bsw()) >+ iounmap(priv->ilb_base_addr); >+ > return rc; > } > EXPORT_SYMBOL_GPL(tpm_tis_core_init); >-- >2.14.3
