From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Stanimir Varbanov <stanimir.varbanov@linaro.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH][next] media: venus: hfi_msgs.h: Replace one-element arrays with flexible-array members
Date: Wed, 10 Feb 2021 18:10:44 -0600 [thread overview]
Message-ID: <20210211001044.GA69612@embeddedor> (raw)
There is a regular need in the kernel to provide a way to declare having
a dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].
Use flexible-array members in struct hfi_msg_sys_property_info_pkt and
hfi_msg_session_property_info_pkt instead of one-element arrays.
Also, this helps with the ongoing efforts to enable -Warray-bounds by
fixing the following warnings:
CC [M] drivers/media/platform/qcom/venus/hfi_msgs.o
drivers/media/platform/qcom/venus/hfi_msgs.c: In function ‘hfi_sys_property_info’:
drivers/media/platform/qcom/venus/hfi_msgs.c:246:35: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
246 | if (req_bytes < 128 || !pkt->data[1] || pkt->num_properties > 1)
| ~~~~~~~~~^~~
drivers/media/platform/qcom/venus/hfi_msgs.c: In function ‘hfi_session_prop_info’:
drivers/media/platform/qcom/venus/hfi_msgs.c:342:62: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
342 | if (!req_bytes || req_bytes % sizeof(*buf_req) || !pkt->data[1])
| ~~~~~~~~~^~~
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Build-tested-by: <lkp@intel.com>
Link: https://lore.kernel.org/lkml/6023dd80.MmTeFf8SzwX0iK7%2F%25lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/media/platform/qcom/venus/hfi_msgs.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.h b/drivers/media/platform/qcom/venus/hfi_msgs.h
index 526d9f5b487b..e2d2ccfbdd24 100644
--- a/drivers/media/platform/qcom/venus/hfi_msgs.h
+++ b/drivers/media/platform/qcom/venus/hfi_msgs.h
@@ -113,7 +113,7 @@ struct hfi_msg_sys_ping_ack_pkt {
struct hfi_msg_sys_property_info_pkt {
struct hfi_pkt_hdr hdr;
u32 num_properties;
- u32 data[1];
+ u32 data[];
};
struct hfi_msg_session_load_resources_done_pkt {
@@ -233,7 +233,7 @@ struct hfi_msg_session_parse_sequence_header_done_pkt {
struct hfi_msg_session_property_info_pkt {
struct hfi_session_hdr_pkt shdr;
u32 num_properties;
- u32 data[1];
+ u32 data[];
};
struct hfi_msg_session_release_resources_done_pkt {
--
2.27.0
next reply other threads:[~2021-02-11 0:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 0:10 Gustavo A. R. Silva [this message]
2021-03-04 1:43 ` [PATCH][next] media: venus: hfi_msgs.h: Replace one-element arrays with flexible-array members Gustavo A. R. Silva
2021-05-11 15:46 ` Gustavo A. R. Silva
2021-05-12 11:39 ` Stanimir Varbanov
2021-05-12 16:37 ` Gustavo A. R. Silva
2021-05-17 11:01 ` Stanimir Varbanov
2021-05-19 16:15 ` Gustavo A. R. Silva
2021-06-04 0:47 ` Gustavo A. R. Silva
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