From 13b47cfcfc60495cde216eef4c01040d76174cbe Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Tue, 20 Jun 2017 11:38:02 +0200 Subject: tpm: fix a kernel memory leak in tpm-sysfs.c 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@vger.kernel.org Fixes: 0883743825e3 ("TPM: sysfs functions consolidation") Reported-by: Jason Gunthorpe Tested-by: Stefan Berger Signed-off-by: Jarkko Sakkinen Signed-off-by: James Morris --- drivers/char/tpm/tpm-sysfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/char') diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 938d03ce30fe..86f38d239476 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -36,9 +36,10 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, ssize_t err; int i, rc; char *str = buf; - struct tpm_chip *chip = to_tpm_chip(dev); + memset(&tpm_cmd, 0, sizeof(tpm_cmd)); + tpm_cmd.header.in = tpm_readpubek_header; err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE, READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, -- cgit v1.2.3