3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
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.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm-sysfs.c | 2 ++
1 file changed, 2 insertions(+)
--- 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
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");