ath11k: fix memory OOB access in qmi_decode

The decoded_size is wrongly assigned in ath11k_qmi_msg_handlers and it results
in out of boundary access in qmi_decode. The correct decoded_size should be
calculated from the related ind_msg structure.

This issue is exposed with QCA6390 because it needs 11 small memory chunks
which are stored in qmi_wlanfw_request_mem_ind_msg_v01 and hence the
decoded_size exceeds the wrongly assigend decoded_size.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.1.0.1-01238-QCAHKSWPL_SILICONZ-2
Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1597389030-13887-9-git-send-email-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/qmi.c

@@ -2477,21 +2477,21 @@ static const struct qmi_msg_handler ath11k_qmi_msg_handlers[] = {
 		.type = QMI_INDICATION,
 		.msg_id = QMI_WLFW_REQUEST_MEM_IND_V01,
 		.ei = qmi_wlanfw_request_mem_ind_msg_v01_ei,
-		.decoded_size = sizeof(qmi_wlanfw_request_mem_ind_msg_v01_ei),
+		.decoded_size = sizeof(struct qmi_wlanfw_request_mem_ind_msg_v01),
 		.fn = ath11k_qmi_msg_mem_request_cb,
 	},
 	{
 		.type = QMI_INDICATION,
 		.msg_id = QMI_WLFW_FW_MEM_READY_IND_V01,
 		.ei = qmi_wlanfw_mem_ready_ind_msg_v01_ei,
-		.decoded_size = sizeof(qmi_wlanfw_mem_ready_ind_msg_v01_ei),
+		.decoded_size = sizeof(struct qmi_wlanfw_fw_mem_ready_ind_msg_v01),
 		.fn = ath11k_qmi_msg_mem_ready_cb,
 	},
 	{
 		.type = QMI_INDICATION,
 		.msg_id = QMI_WLFW_FW_READY_IND_V01,
 		.ei = qmi_wlanfw_fw_ready_ind_msg_v01_ei,
-		.decoded_size = sizeof(qmi_wlanfw_fw_ready_ind_msg_v01_ei),
+		.decoded_size = sizeof(struct qmi_wlanfw_fw_ready_ind_msg_v01),
 		.fn = ath11k_qmi_msg_fw_ready_cb,
 	},
 	{
@@ -2499,7 +2499,7 @@ static const struct qmi_msg_handler ath11k_qmi_msg_handlers[] = {
 		.msg_id = QMI_WLFW_COLD_BOOT_CAL_DONE_IND_V01,
 		.ei = qmi_wlanfw_cold_boot_cal_done_ind_msg_v01_ei,
 		.decoded_size =
-			sizeof(qmi_wlanfw_cold_boot_cal_done_ind_msg_v01_ei),
+			sizeof(struct qmi_wlanfw_fw_cold_cal_done_ind_msg_v01),
 		.fn = ath11k_qmi_msg_cold_boot_cal_done_cb,
 	},
 };

drivers/net/wireless/ath/ath11k/qmi.h

@@ -267,6 +267,14 @@ struct qmi_wlanfw_fw_mem_ready_ind_msg_v01 {
 	char placeholder;
 };
 
+struct qmi_wlanfw_fw_ready_ind_msg_v01 {
+	char placeholder;
+};
+
+struct qmi_wlanfw_fw_cold_cal_done_ind_msg_v01 {
+	char placeholder;
+};
+
 #define QMI_WLANFW_CAP_REQ_MSG_V01_MAX_LEN	0
 #define QMI_WLANFW_CAP_RESP_MSG_V01_MAX_LEN	207
 #define QMI_WLANFW_CAP_REQ_V01			0x0024