FAILED: patch "[PATCH] tpm: fix a kernel memory leak in tpm-sysfs.c" failed to apply to 3.18-stable tree

The patch below does not apply to the 3.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Jarkko Sakkinen <[email protected]>
Date: Tue, 20 Jun 2017 11:38:02 +0200
Subject: [PATCH] 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.

index 938d03ce30fe..86f38d239476 100644
@@ -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,