Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.19 071/207] firmware: arm_scmi: Harden accesses to the reset domains | Date | Mon, 26 Sep 2022 12:11:00 +0200 |
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From: Cristian Marussi <cristian.marussi@arm.com>
[ Upstream commit e9076ffbcaed5da6c182b144ef9f6e24554af268 ]
Accessing reset domains descriptors by the index upon the SCMI drivers requests through the SCMI reset operations interface can potentially lead to out-of-bound violations if the SCMI driver misbehave.
Add an internal consistency check before any such domains descriptors accesses.
Link: https://lore.kernel.org/r/20220817172731.1185305-5-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Stable-dep-of: b75c83d9b961 ("firmware: arm_scmi: Fix the asynchronous reset requests") Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/firmware/arm_scmi/reset.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c index 673f3eb498f4..b0494165b1cb 100644 --- a/drivers/firmware/arm_scmi/reset.c +++ b/drivers/firmware/arm_scmi/reset.c @@ -166,8 +166,12 @@ static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain, struct scmi_xfer *t; struct scmi_msg_reset_domain_reset *dom; struct scmi_reset_info *pi = ph->get_priv(ph); - struct reset_dom_info *rdom = pi->dom_info + domain; + struct reset_dom_info *rdom; + if (domain >= pi->num_domains) + return -EINVAL; + + rdom = pi->dom_info + domain; if (rdom->async_reset) flags |= ASYNCHRONOUS_RESET; -- 2.35.1
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