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 4.12-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-4.12 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 | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 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
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,
Patches currently in stable-queue which might be from jarkko.sakkinen@xxxxxxxxxxxxxxx are
queue-4.12/add-shutdown-to-struct-class.patch
queue-4.12/tpm-issue-a-tpm2_shutdown-for-tpm2-devices.patch
queue-4.12/tpm-fix-a-kernel-memory-leak-in-tpm-sysfs.c.patch