linux-hardening - [PATCH][next] media: venus: hfi_cmds: Replace fake flex-arrays with flexible-array members

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Date:   Tue, 16 May 2023 19:18:01 -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>
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
Subject: [PATCH][next] media: venus: hfi_cmds: Replace fake flex-arrays with
 flexible-array members

One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element arrays with flexible-array
members in multiple structures.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

This results in no differences in binary output.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/294
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/media/platform/qcom/venus/hfi_cmds.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.h b/drivers/media/platform/qcom/venus/hfi_cmds.h
index dd9c5066442d..55dd73ff073b 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.h
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.h
@@ -82,7 +82,7 @@ struct hfi_sys_set_buffers_pkt {
 	u32 buffer_type;
 	u32 buffer_size;
 	u32 num_buffers;
-	u32 buffer_addr[1];
+	u32 buffer_addr[];
 };
 
 struct hfi_sys_ping_pkt {
@@ -177,7 +177,7 @@ struct hfi_session_empty_buffer_uncompressed_plane1_pkt {
 	u32 filled_len;
 	u32 offset;
 	u32 packet_buffer2;
-	u32 data[1];
+	u32 data[];
 };
 
 struct hfi_session_empty_buffer_uncompressed_plane2_pkt {
@@ -186,7 +186,7 @@ struct hfi_session_empty_buffer_uncompressed_plane2_pkt {
 	u32 filled_len;
 	u32 offset;
 	u32 packet_buffer3;
-	u32 data[1];
+	u32 data[];
 };
 
 struct hfi_session_fill_buffer_pkt {
@@ -227,7 +227,7 @@ struct hfi_session_release_buffer_pkt {
 	u32 extradata_size;
 	u32 response_req;
 	u32 num_buffers;
-	u32 buffer_info[1];
+	u32 buffer_info[];
 };
 
 struct hfi_session_release_resources_pkt {
-- 
2.34.1