Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755080AbbLIJrX (ORCPT ); Wed, 9 Dec 2015 04:47:23 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:45557 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754987AbbLIJl4 (ORCPT ); Wed, 9 Dec 2015 04:41:56 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Christophe JAILLET , Jarkko Sakkinen , Luis Henriques Subject: [PATCH 3.16.y-ckt 115/126] TPM: Avoid reference to potentially freed memory Date: Wed, 9 Dec 2015 09:38:05 +0000 Message-Id: <1449653896-5236-116-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1449653896-5236-1-git-send-email-luis.henriques@canonical.com> References: <1449653896-5236-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1833 Lines: 54 3.16.7-ckt21 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Christophe JAILLET commit eb8ed1eb9a158c460d10205eaff71fd4ac67c160 upstream. Reference to the 'np' node is dropped before dereferencing the 'sizep' and 'basep' pointers, which could by then point to junk if the node has been freed. Refactor code to call 'of_node_put' later. Fixes: c5df39262dd5 ("drivers/char/tpm: Add securityfs support for event log") Signed-off-by: Christophe JAILLET Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Acked-by: Peter Huewe [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques --- drivers/char/tpm/tpm_of.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c index 98ba2bd1a355..565a0b39ae4e 100644 --- a/drivers/char/tpm/tpm_of.c +++ b/drivers/char/tpm/tpm_of.c @@ -53,17 +53,18 @@ int read_log(struct tpm_bios_log *log) goto cleanup_eio; } - of_node_put(np); log->bios_event_log = kmalloc(*sizep, GFP_KERNEL); if (!log->bios_event_log) { pr_err("%s: ERROR - Not enough memory for BIOS measurements\n", __func__); + of_node_put(np); return -ENOMEM; } log->bios_event_log_end = log->bios_event_log + *sizep; memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), *sizep); + of_node_put(np); return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/