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tpm: fix a kernel memory leak in tpm-sysfs.c

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commit 13b47cfcfc60495cde216eef4c01040d76174cbe upstream.

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.

Fixes: 0883743825e3 ("TPM: sysfs functions consolidation")
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jarkko Sakkinen 2017-06-20 11:38:02 +02:00 committed by Greg Kroah-Hartman
parent 25b2ee6f9d
commit 525ea5950e
1 changed files with 2 additions and 1 deletions
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3
drivers/char/tpm/tpm-sysfs.c
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@ -35,9 +35,10 @@ 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, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0,
"attempting to read the PUBEK");