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firmware: arm_scmi: Harden accesses to the reset domains

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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>
This commit is contained in:
Cristian Marussi 2022-08-17 18:27:29 +01:00 committed by Sudeep Holla
parent 76f89c9547
commit e9076ffbca
1 changed files with 5 additions and 1 deletions
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6
drivers/firmware/arm_scmi/reset.c
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@ -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;