linux-kernel - [PATCH 1/2] crypto: ccp: Avoid discarding errors in psp_send_platform_access

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Date: Wed, 7 Feb 2024 15:54:38 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Herbert Xu <herbert@...dor.apana.org.au>
CC: Mario Limonciello <mario.limonciello@....com>, Tom Lendacky
	<thomas.lendacky@....com>, John Allen <john.allen@....com>, "open list:AMD
 CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - DB..."
	<linux-crypto@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
	"Tim Van Patten" <timvp@...gle.com>
Subject: [PATCH 1/2] crypto: ccp: Avoid discarding errors in psp_send_platform_access_msg()

When the PSP_CMDRESP_STS field has an error set, the details of the
error are in `req->header->status`, and the caller will want to look
at them. But if there is no error set then caller may want to check
`req->header->status` separately.

Stop discarding these errors.

Reported-by: Tim Van Patten <timvp@...gle.com>
Fixes: 7ccc4f4e2e50 ("crypto: ccp - Add support for an interface for platform features")
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/crypto/ccp/platform-access.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/platform-access.c b/drivers/crypto/ccp/platform-access.c
index 94367bc49e35..792ae8d5b11a 100644
--- a/drivers/crypto/ccp/platform-access.c
+++ b/drivers/crypto/ccp/platform-access.c
@@ -120,7 +120,8 @@ int psp_send_platform_access_msg(enum psp_platform_access_msg msg,
 
 	/* Store the status in request header for caller to investigate */
 	cmd_reg = ioread32(cmd);
-	req->header.status = FIELD_GET(PSP_CMDRESP_STS, cmd_reg);
+	if (FIELD_GET(PSP_CMDRESP_STS, cmd_reg))
+		req->header.status = FIELD_GET(PSP_CMDRESP_STS, cmd_reg);
 	if (req->header.status) {
 		ret = -EIO;
 		goto unlock;
-- 
2.34.1