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Commit 3072928f authored by Andi Shyti's avatar Andi Shyti Committed by Rajiv Andrade
Browse files

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: default avatarAndi Shyti <andi.shyti@gmail.com>
Signed-off-by: default avatarPeter Huewe <peterhuewe@gmx.de>
Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
parent dad79cb8

drivers/char/tpm/tpm.c

+6 −0
Original line number Diff line number Diff line
@@ -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);