From: Cristian Marussi cristian.marussi@arm.com
stable inclusion from stable-5.10.55 commit fe5fe0b1c8b91877c3b35482fc08c35cc9586842 bugzilla: 175636 https://gitee.com/openeuler/kernel/issues/I4DYWD
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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
Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.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 6fa024d1dd99..8c9663258d5d 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -615,8 +615,9 @@ 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 maximum messages %d, not in range [1 - %lu]\n", desc->max_msg, MSG_TOKEN_MAX); return -EINVAL; }