linux-kernel - [PATCH 1/3] crypto: ccp - Validate that platform access mailbox registers are declared

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Date:   Thu, 18 May 2023 22:24:12 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>
CC:     John Allen <john.allen@....com>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 1/3] crypto: ccp - Validate that platform access mailbox registers are declared

Some platforms might support platform access doorbell but not mailbox.
Add an extra guard to ensure this doesn't cause accesses to wrong ranges
if a consumer calls psp_send_platform_access_msg().

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/crypto/ccp/platform-access.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/ccp/platform-access.c b/drivers/crypto/ccp/platform-access.c
index 939c924fc383..94367bc49e35 100644
--- a/drivers/crypto/ccp/platform-access.c
+++ b/drivers/crypto/ccp/platform-access.c
@@ -67,6 +67,11 @@ int psp_send_platform_access_msg(enum psp_platform_access_msg msg,
 		return -ENODEV;
 
 	pa_dev = psp->platform_access_data;
+
+	if (!pa_dev->vdata->cmdresp_reg || !pa_dev->vdata->cmdbuff_addr_lo_reg ||
+	    !pa_dev->vdata->cmdbuff_addr_hi_reg)
+		return -ENODEV;
+
 	cmd = psp->io_regs + pa_dev->vdata->cmdresp_reg;
 	lo = psp->io_regs + pa_dev->vdata->cmdbuff_addr_lo_reg;
 	hi = psp->io_regs + pa_dev->vdata->cmdbuff_addr_hi_reg;
-- 
2.34.1