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authorAndi Shyti <andi.shyti@gmail.com>2012-05-28 18:42:45 +0200
committerRajiv Andrade <srajiv@linux.vnet.ibm.com>2012-06-12 18:53:51 -0300
commit3072928ff2457642af0da745b88f0420b4596c48 (patch)
treed097ad703bcc2f25872bac17a75088a2af4ea725 /drivers/char
parentdad79cb89254ce646906846b0f0cf7995d626710 (diff)
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 <andi.shyti@gmail.com> Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index dae254d5372..d39b1f60ba2 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);