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Message-Id: <20210712141833.6628-3-cristian.marussi@arm.com>
Date: Mon, 12 Jul 2021 15:18:18 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
virtualization@...ts.linux-foundation.org,
virtio-dev@...ts.oasis-open.org
Cc: sudeep.holla@....com, james.quinlan@...adcom.com,
Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
etienne.carriere@...aro.org, vincent.guittot@...aro.org,
souvik.chakravarty@....com, cristian.marussi@....com,
igor.skalkin@...nsynergy.com, peter.hilber@...nsynergy.com,
alex.bennee@...aro.org, jean-philippe@...aro.org,
mikhail.golubev@...nsynergy.com, anton.yakovlev@...nsynergy.com,
Vasyl.Vavrychuk@...nsynergy.com,
Andriy.Tryshnivskyy@...nsynergy.com
Subject: [PATCH v6 02/17] firmware: arm_scmi: Fix max pending messages boundary check
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 accordignly the checks performed on the value exported by transports
in scmi_desc.max_msg.
Reported-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
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 66e5e694be7d..d2c98642cb14 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -1025,8 +1025,9 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,
const struct scmi_desc *desc = sinfo->desc;
/* 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 max_msg %d. Maximum messages supported %lu.\n",
desc->max_msg, MSG_TOKEN_MAX);
return -EINVAL;
}
--
2.17.1
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