From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Peter Huewe <peterhuewe-Mmb7MZpHnFY@public.gmane.org>
Cc: "moderated list:TPM DEVICE DRIVER"
<tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: [PATCH v2] tpm: tpm_transmit() does not check for minimum buffer size.
Date: Mon, 12 Sep 2016 13:43:30 +0300 [thread overview]
Message-ID: <1473677010-13737-1-git-send-email-jarkko.sakkinen@linux.intel.com> (raw)
tpm_transmit() does not check that bufsiz is at least TPM_HEADER_SIZE
before accessing data. This commit adds the check and returns -ENOMEM.
v2: Updated commit msg
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/char/tpm/tpm-interface.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index fd863ff..6a67f7f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -337,6 +337,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
u32 count, ordinal;
unsigned long stop;
+ if (bufsiz < TPM_HEADER_SIZE)
+ return -EINVAL;
+
if (bufsiz > TPM_BUFSIZE)
bufsiz = TPM_BUFSIZE;
--
2.7.4
------------------------------------------------------------------------------
next reply other threads:[~2016-09-12 10:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-12 10:43 Jarkko Sakkinen [this message]
[not found] ` <1473677010-13737-1-git-send-email-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-09-12 17:32 ` [PATCH v2] tpm: tpm_transmit() does not check for minimum buffer size Jason Gunthorpe
[not found] ` <20160912173219.GA5843-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-09-12 20:16 ` Jarkko Sakkinen
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