From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Neelesh Gupta , Benjamin Herrenschmidt , Luis Henriques Subject: [PATCH 3.16.y-ckt 071/128] powerpc/powernv: Fix the overflow of OPAL message notifiers head array Date: Sun, 24 Jan 2016 22:00:26 +0000 Message-Id: <1453672883-2708-72-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1453672883-2708-1-git-send-email-luis.henriques@canonical.com> References: <1453672883-2708-1-git-send-email-luis.henriques@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.16.7-ckt23 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Neelesh Gupta commit 792f96e9a769b799a2944e9369e4ea1e467135b2 upstream. Fixes the condition check of incoming message type which can otherwise shoot beyond the message notifiers head array. Signed-off-by: Neelesh Gupta Reviewed-by: Vasant Hegde Reviewed-by: Anshuman Khandual Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Luis Henriques --- arch/powerpc/platforms/powernv/opal.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 199975613fe9..d5e5794db989 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -286,16 +286,12 @@ void opal_notifier_disable(void) int opal_message_notifier_register(enum OpalMessageType msg_type, struct notifier_block *nb) { - if (!nb) { - pr_warning("%s: Invalid argument (%p)\n", - __func__, nb); - return -EINVAL; - } - if (msg_type > OPAL_MSG_TYPE_MAX) { - pr_warning("%s: Invalid message type argument (%d)\n", + if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { + pr_warning("%s: Invalid arguments, msg_type:%d\n", __func__, msg_type); return -EINVAL; } + return atomic_notifier_chain_register( &opal_msg_notifier_head[msg_type], nb); } @@ -332,7 +328,7 @@ static void opal_handle_message(void) type = be32_to_cpu(msg.msg_type); /* Sanity check */ - if (type > OPAL_MSG_TYPE_MAX) { + if (type >= OPAL_MSG_TYPE_MAX) { pr_warning("%s: Unknown message type: %u\n", __func__, type); return; }