linux-hardening - [PATCH 2/2][next] media: venus: hfi_cmds: Use struct

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Message-ID: <fd52d6ddce285474615e4bd96931ab12a0da8199.1684278538.git.gustavoars@kernel.org>
Date:   Tue, 16 May 2023 17:14:49 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        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
Subject: [PATCH 2/2][next] media: venus: hfi_cmds: Use struct_size() helper

Prefer struct_size() over open-coded versions of idiom:

sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count

where count is the max number of items the flexible array is supposed to
contain.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/media/platform/qcom/venus/hfi_cmds.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.c b/drivers/media/platform/qcom/venus/hfi_cmds.c
index 21d1b3c90dc0..3f74d518ad08 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.c
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.c
@@ -209,8 +209,8 @@ int pkt_session_set_buffers(struct hfi_session_set_buffers_pkt *pkt,
 		}
 	} else {
 		pkt->extradata_size = 0;
-		pkt->shdr.hdr.size = sizeof(*pkt) +
-			bd->num_buffers * sizeof(u32);
+		pkt->shdr.hdr.size = struct_size(pkt, buffer_info,
+						 bd->num_buffers);
 		for (i = 0; i < pkt->num_buffers; i++)
 			pkt->buffer_info[i] = bd->device_addr;
 	}
@@ -251,8 +251,8 @@ int pkt_session_unset_buffers(struct hfi_session_release_buffer_pkt *pkt,
 
 		pkt->extradata_size = 0;
 		pkt->shdr.hdr.size =
-				sizeof(struct hfi_session_set_buffers_pkt) +
-				bd->num_buffers * sizeof(u32);
+			struct_size((struct hfi_session_set_buffers_pkt *)0,
+				    buffer_info, bd->num_buffers);
 	}
 
 	pkt->response_req = bd->response_required;
-- 
2.34.1