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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Cristian Marussi <cristian.marussi@arm.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 15/17] firmware: arm_scmi: Fix range check for the maximum number of pending messages
Date: Thu, 29 Jul 2021 15:54:16 +0200	[thread overview]
Message-ID: <20210729135137.740591597@linuxfoundation.org> (raw)
In-Reply-To: <20210729135137.260993951@linuxfoundation.org>

From: Cristian Marussi <cristian.marussi@arm.com>

[ Upstream commit bdb8742dc6f7c599c3d61959234fe4c23638727b ]

SCMI message headers carry a sequence number and such field is sized to
allow for MSG_TOKEN_MAX distinct numbers; moreover zero is not really an
acceptable maximum number of pending in-flight messages.

Fix accordingly the checks performed on the value exported by transports
in scmi_desc.max_msg

Link: https://lore.kernel.org/r/20210712141833.6628-3-cristian.marussi@arm.com
Reported-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
[sudeep.holla: updated the patch title and error message]
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/firmware/arm_scmi/driver.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 081fbe28da4b..af5139eb96b5 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -629,8 +629,9 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
 	struct scmi_xfers_info *info = &sinfo->minfo;
 
 	/* Pre-allocated messages, no more than what hdr.seq can support */
-	if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) {
-		dev_err(dev, "Maximum message of %d exceeds supported %ld\n",
+	if (WARN_ON(!desc->max_msg || desc->max_msg > MSG_TOKEN_MAX)) {
+		dev_err(dev,
+			"Invalid maximum messages %d, not in range [1 - %lu]\n",
 			desc->max_msg, MSG_TOKEN_MAX);
 		return -EINVAL;
 	}
-- 
2.30.2




  parent reply	other threads:[~2021-07-29 13:56 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 13:54 [PATCH 4.19 00/17] 4.19.200-rc1 review Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 01/17] selftest: fix build error in tools/testing/selftests/vm/userfaultfd.c Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 02/17] iio: dac: ds4422/ds4424 drop of_node check Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 03/17] KVM: x86: determine if an exception has an error code only when injecting it Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 04/17] net: split out functions related to registering inflight socket files Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 05/17] af_unix: fix garbage collect vs MSG_PEEK Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 06/17] workqueue: fix UAF in pwq_unbound_release_workfn() Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 07/17] net/802/mrp: fix memleak in mrp_request_join() Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 08/17] net/802/garp: fix memleak in garp_request_join() Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 09/17] net: annotate data race around sk_ll_usec Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 10/17] sctp: move 198 addresses from unusable to private scope Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 11/17] hfs: add missing clean-up in hfs_fill_super Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 12/17] hfs: fix high memory mapping in hfs_bnode_read Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 13/17] hfs: add lock nesting notation to hfs_find_init Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 14/17] firmware: arm_scmi: Fix possible scmi_linux_errmap buffer overflow Greg Kroah-Hartman
2021-07-29 13:54 ` Greg Kroah-Hartman [this message]
2021-07-29 13:54 ` [PATCH 4.19 16/17] cifs: fix the out of range assignment to bit fields in parse_server_interfaces Greg Kroah-Hartman
2021-07-29 13:54 ` [PATCH 4.19 17/17] ARM: dts: versatile: Fix up interrupt controller node names Greg Kroah-Hartman
2021-07-29 19:47 ` [PATCH 4.19 00/17] 4.19.200-rc1 review Pavel Machek
2021-07-29 22:50 ` Shuah Khan
2021-07-30 10:20 ` Sudip Mukherjee
2021-07-30 11:27 ` Naresh Kamboju
2021-07-31  4:42 ` Guenter Roeck

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