| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 19/93] mmc: pxamci: fix potential oops | Date | Thu, 6 Oct 2016 10:28:49 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Robert Jarzmik <robert.jarzmik@free.fr>
commit b3802db5eb72d2a96f4aa4ff0abb937033df2acf upstream.
As reported by Dan in his report in [1], there is a potential NULL pointer derefence if these conditions are met : - there is no platform_data provided, ie. host->pdata = NULL
Fix this by only using the platform data ro_invert when a gpio for read-only is provided by the platform data.
This doesn't appear yet as every pxa board provides a platform_data, and calls pxa_set_mci_info() with a non NULL pointer.
[1] [bug report] mmc: pxamci: fix card detect with slot-gpio API. The commit fd546ee6a7dc ("mmc: pxamci: fix card detect with slot-gpio API") from Sep 26, 2015, leads to the following static checker warning:
drivers/mmc/host/pxamci.c:809 pxamci_probe() warn: variable dereferenced before check 'host->pdata' (see line 798)
Fixes: fd546ee6a7dc ("mmc: pxamci: fix card detect with slot-gpio API") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/mmc/host/pxamci.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/mmc/host/pxamci.c +++ b/drivers/mmc/host/pxamci.c @@ -798,14 +798,16 @@ static int pxamci_probe(struct platform_ gpio_direction_output(gpio_power, host->pdata->gpio_power_invert); } - if (gpio_is_valid(gpio_ro)) + if (gpio_is_valid(gpio_ro)) { ret = mmc_gpio_request_ro(mmc, gpio_ro); - if (ret) { - dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro); - goto out; - } else { - mmc->caps2 |= host->pdata->gpio_card_ro_invert ? - 0 : MMC_CAP2_RO_ACTIVE_HIGH; + if (ret) { + dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", + gpio_ro); + goto out; + } else { + mmc->caps2 |= host->pdata->gpio_card_ro_invert ? + 0 : MMC_CAP2_RO_ACTIVE_HIGH; + } } if (gpio_is_valid(gpio_cd))
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