While cleaning up sysfs callback that prints EK we discovered a kernel memory leak. This commit fixes the issue by zeroing the buffer used for TPM command/response. The leak happen when we use either tpm_vtpm_proxy, tpm_ibmvtpm or xen-tpmfront. Cc: stable@xxxxxxxxxxxxxxx Fixes: 0883743825e3 ("TPM: sysfs functions consolidation") Reported-by: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx> Tested-by: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Signed-off-by: James Morris <james.l.morris@xxxxxxxxxx> --- Backport for v3.18. Original commit ID: 13b47cfcfc60495cde216eef4c01040d76174cbe drivers/char/tpm/tpm-sysfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 01730a27ae07..7206f417779b 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -57,6 +57,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, struct tpm_chip *chip = dev_get_drvdata(dev); + memset(&tpm_cmd, 0, sizeof(tpm_cmd)); + tpm_cmd.header.in = tpm_readpubek_header; err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, "attempting to read the PUBEK"); -- 2.11.0