This is a note to let you know that I've just added the patch titled tpm: fix a kernel memory leak in tpm-sysfs.c to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tpm-fix-a-kernel-memory-leak-in-tpm-sysfs.c.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 13b47cfcfc60495cde216eef4c01040d76174cbe Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Date: Tue, 20 Jun 2017 11:38:02 +0200 Subject: tpm: fix a kernel memory leak in tpm-sysfs.c 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. 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 @@ -38,6 +38,8 @@ 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 = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0, "attempting to read the PUBEK"); Patches currently in stable-queue which might be from jarkko.sakkinen@xxxxxxxxxxxxxxx are queue-4.4/tpm-fix-a-kernel-memory-leak-in-tpm-sysfs.c.patch queue-4.4/tpm-replace-device-number-bitmap-with-idr.patch