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authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2017-06-20 12:38:02 +0300
committerJames Morris <james.l.morris@oracle.com>2017-07-07 02:49:24 +0300
commit13b47cfcfc60495cde216eef4c01040d76174cbe (patch)
treee052e8beacb8578b588a2ab84990d70593b8e496 /drivers/char
parentd1bd4a792d3961a04e6154118816b00167aad91a (diff)
downloadlinux-13b47cfcfc60495cde216eef4c01040d76174cbe.tar.xz
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 <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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm-sysfs.c3
1 files changed, 2 insertions, 1 deletions
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,