linux-kernel - [PATCH v6 01/13] firmware: qcom: qseecom: fix memory leaks in error paths

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Message-Id: <20231127141600.20929-2-brgl@bgdev.pl>
Date:   Mon, 27 Nov 2023 15:15:48 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Andrew Halaney <ahalaney@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Alex Elder <elder@...aro.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...cinc.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <error27@...il.com>
Subject: [PATCH v6 01/13] firmware: qcom: qseecom: fix memory leaks in error paths

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Fix instances of returning error codes directly instead of jumping to
the relevant labels where memory allocated for the SCM calls would be
freed.

Fixes: 759e7a2b62eb ("firmware: Add support for Qualcomm UEFI Secure Application")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Closes: https://lore.kernel.org/r/202311270828.k4HGcjiL-lkp@intel.com/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 .../firmware/qcom/qcom_qseecom_uefisecapp.c   | 20 ++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
index a33acdaf7b78..32188f098ef3 100644
--- a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
+++ b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c
@@ -325,8 +325,10 @@ static efi_status_t qsee_uefi_get_variable(struct qcuefi_client *qcuefi, const e
 	req_data->length = req_size;
 
 	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length);
-	if (status < 0)
-		return EFI_INVALID_PARAMETER;
+	if (status < 0) {
+		efi_status = EFI_INVALID_PARAMETER;
+		goto out_free;
+	}
 
 	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
 
@@ -471,8 +473,10 @@ static efi_status_t qsee_uefi_set_variable(struct qcuefi_client *qcuefi, const e
 	req_data->length = req_size;
 
 	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length);
-	if (status < 0)
-		return EFI_INVALID_PARAMETER;
+	if (status < 0) {
+		efi_status = EFI_INVALID_PARAMETER;
+		goto out_free;
+	}
 
 	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
 
@@ -563,8 +567,10 @@ static efi_status_t qsee_uefi_get_next_variable(struct qcuefi_client *qcuefi,
 	memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
 	status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name,
 			      *name_size / sizeof(*name));
-	if (status < 0)
-		return EFI_INVALID_PARAMETER;
+	if (status < 0) {
+		efi_status = EFI_INVALID_PARAMETER;
+		goto out_free;
+	}
 
 	status = qcom_qseecom_app_send(qcuefi->client, req_data, req_size, rsp_data, rsp_size);
 	if (status) {
@@ -635,7 +641,7 @@ static efi_status_t qsee_uefi_get_next_variable(struct qcuefi_client *qcuefi,
 		 * have already been validated above, causing this function to
 		 * bail with EFI_BUFFER_TOO_SMALL.
 		 */
-		return EFI_DEVICE_ERROR;
+		efi_status = EFI_DEVICE_ERROR;
 	}
 
 out_free:
-- 
2.40.1