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firmware: arm_scmi: Reject out of range DT protocol IDs

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SCMI protocol IDs carried in message headers are limited by
MSG_PROTOCOL_ID_MASK. The DT parsing paths noticed protocol IDs
outside that range, but only logged an error and then kept processing
the invalid value.

That lets a malformed 32-bit DT reg value reach helpers which take a u8
protocol ID, where it can be truncated and/or treated as a different
protocol.

For channel setup, two different out-of-range values can also be used as
distinct IDR keys while aliasing the generated SCMI protocol identity.

Skip DT protocol nodes whose reg value does not fit the SCMI protocol ID
field before setting up channels or creating protocol devices.

Fixes: 05a2801d8b ("firmware: arm_scmi: Use dedicated devices to initialize channels")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Link: https://patch.msgid.link/20260714-scmi_core_fixes-v6-7-3afe499d46e3@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
This commit is contained in:
Sudeep Holla 2026-07-14 13:56:26 +01:00
parent c38b1e1948
commit 59407ccb52
1 changed files with 6 additions and 2 deletions
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8
drivers/firmware/arm_scmi/driver.c
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@ -2873,9 +2873,11 @@ static int scmi_channels_setup(struct scmi_info *info)
if (of_property_read_u32(child, "reg", &prot_id))
continue;
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id)) {
dev_err(info->dev,
"Out of range protocol %d\n", prot_id);
continue;
}
ret = scmi_txrx_setup(info, child, prot_id);
if (ret)
@ -3339,8 +3341,10 @@ static int scmi_probe(struct platform_device *pdev)
if (of_property_read_u32(child, "reg", &prot_id))
continue;
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id)) {
dev_err(dev, "Out of range protocol %d\n", prot_id);
continue;
}
if (!scmi_is_protocol_implemented(handle, prot_id)) {
dev_err(dev, "SCMI protocol %d not implemented\n",