From 3072928ff2457642af0da745b88f0420b4596c48 Mon Sep 17 00:00:00 2001 From: Andi Shyti Date: Mon, 28 May 2012 18:42:45 +0200 Subject: [PATCH] tpm: check the chip reference before using it If a driver calls tpm_dev_vendor_release for a device already released then the driver will oops. Signed-off-by: Andi Shyti Signed-off-by: Peter Huewe Signed-off-by: Rajiv Andrade --- drivers/char/tpm/tpm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index dae254d53723..d39b1f60ba23 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -1330,6 +1330,9 @@ EXPORT_SYMBOL_GPL(tpm_pm_resume); void tpm_dev_vendor_release(struct tpm_chip *chip) { + if (!chip) + return; + if (chip->vendor.release) chip->vendor.release(chip->dev); @@ -1347,6 +1350,9 @@ void tpm_dev_release(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); + if (!chip) + return; + tpm_dev_vendor_release(chip); chip->release(dev); -- 2.30.2