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| author | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-06-20 11:38:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-12 16:53:58 +0200 |
| commit | 062c8518b9e1c5c9ab8a3f719f977be7b458dde4 (patch) | |
| tree | 5950a4e5f0ba70358351074a3e7f0e30a0483f47 | |
| parent | f008ae10ad82a42d0fbe027000851a64dbce4081 (diff) | |
| download | linux-stable-062c8518b9e1c5c9ab8a3f719f977be7b458dde4.tar.gz linux-stable-062c8518b9e1c5c9ab8a3f719f977be7b458dde4.tar.bz2 linux-stable-062c8518b9e1c5c9ab8a3f719f977be7b458dde4.zip | |
tpm: fix a kernel memory leak in tpm-sysfs.c
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>
| -rw-r--r-- | drivers/char/tpm/tpm-sysfs.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index c7aa18f66627..d0cd402d3d95 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, &tpm_cmd, READ_PUBEK_RESULT_SIZE, READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, |