linux-kernel - [PATCH 4.9 167/199] firmware: qcom: scm: Ensure a0 status code is treated as signed

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Message-Id: <20191219183224.710329574@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:34:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Will Deacon <will@...nel.org>
Subject: [PATCH 4.9 167/199] firmware: qcom: scm: Ensure a0 status code is treated as signed

From: Will Deacon <will@...nel.org>

commit ff34f3cce278a0982a7b66b1afaed6295141b1fc upstream.

The 'a0' member of 'struct arm_smccc_res' is declared as 'unsigned long',
however the Qualcomm SCM firmware interface driver expects to receive
negative error codes via this field, so ensure that it's cast to 'long'
before comparing to see if it is less than 0.

Cc: <stable@...r.kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/firmware/qcom_scm-64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -158,7 +158,7 @@ static int qcom_scm_call(struct device *
 		kfree(args_virt);
 	}
 
-	if (res->a0 < 0)
+	if ((long)res->a0 < 0)
 		return qcom_scm_remap_error(res->a0);
 
 	return 0;