linux-hardening - [PATCH v3][venus-for-next-v5.14] media: venus: hfi

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Date:   Wed, 2 Jun 2021 19:17:08 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: [PATCH v3][venus-for-next-v5.14] media: venus: hfi_cmds: Fix packet
 size calculation

Now that a one-element array was replaced with a flexible-array member
in struct hfi_sys_set_property_pkt, use the struct_size() helper to
correctly calculate the packet size.

Fixes: 701e10b3fd9f ("media: venus: hfi_cmds.h: Replace one-element array with flexible-array member")
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v3:
 - Fix size calculation in call to struct_size().
   Link: https://lore.kernel.org/linux-hardening/202106021254.39A1561075@keescook/
   Link: https://lore.kernel.org/linux-hardening/113fd896-464c-6aef-215a-a53ac6103a62@embeddedor.com/

Changes in v2:
 - Include linux/overflow.h for struct_size().

 drivers/media/platform/qcom/venus/hfi_cmds.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.c b/drivers/media/platform/qcom/venus/hfi_cmds.c
index 4b9dea7f6940..f51024786991 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.c
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
  * Copyright (C) 2017 Linaro Ltd.
  */
+#include <linux/overflow.h>
 #include <linux/errno.h>
 #include <linux/hash.h>
 
@@ -27,7 +28,7 @@ void pkt_sys_idle_indicator(struct hfi_sys_set_property_pkt *pkt, u32 enable)
 {
 	struct hfi_enable *hfi = (struct hfi_enable *)&pkt->data[1];
 
-	pkt->hdr.size = sizeof(*pkt) + sizeof(*hfi) + sizeof(u32);
+	pkt->hdr.size = struct_size(pkt, data, 1) + sizeof(*hfi);
 	pkt->hdr.pkt_type = HFI_CMD_SYS_SET_PROPERTY;
 	pkt->num_properties = 1;
 	pkt->data[0] = HFI_PROPERTY_SYS_IDLE_INDICATOR;
@@ -39,7 +40,7 @@ void pkt_sys_debug_config(struct hfi_sys_set_property_pkt *pkt, u32 mode,
 {
 	struct hfi_debug_config *hfi;
 
-	pkt->hdr.size = sizeof(*pkt) + sizeof(*hfi) + sizeof(u32);
+	pkt->hdr.size = struct_size(pkt, data, 1) + sizeof(*hfi);
 	pkt->hdr.pkt_type = HFI_CMD_SYS_SET_PROPERTY;
 	pkt->num_properties = 1;
 	pkt->data[0] = HFI_PROPERTY_SYS_DEBUG_CONFIG;
@@ -50,7 +51,7 @@ void pkt_sys_debug_config(struct hfi_sys_set_property_pkt *pkt, u32 mode,
 
 void pkt_sys_coverage_config(struct hfi_sys_set_property_pkt *pkt, u32 mode)
 {
-	pkt->hdr.size = sizeof(*pkt) + sizeof(u32);
+	pkt->hdr.size = struct_size(pkt, data, 2);
 	pkt->hdr.pkt_type = HFI_CMD_SYS_SET_PROPERTY;
 	pkt->num_properties = 1;
 	pkt->data[0] = HFI_PROPERTY_SYS_CONFIG_COVERAGE;
@@ -116,7 +117,7 @@ void pkt_sys_power_control(struct hfi_sys_set_property_pkt *pkt, u32 enable)
 {
 	struct hfi_enable *hfi = (struct hfi_enable *)&pkt->data[1];
 
-	pkt->hdr.size = sizeof(*pkt) + sizeof(*hfi) + sizeof(u32);
+	pkt->hdr.size = struct_size(pkt, data, 1) + sizeof(*hfi);
 	pkt->hdr.pkt_type = HFI_CMD_SYS_SET_PROPERTY;
 	pkt->num_properties = 1;
 	pkt->data[0] = HFI_PROPERTY_SYS_CODEC_POWER_PLANE_CTRL;
-- 
2.27.0