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* [PATCH][next] media: venus: hfi_cmds.h: Replace one-element array with flexible-array member
@ 2021-02-10 22:57 Gustavo A. R. Silva
  2021-03-04  1:42 ` Gustavo A. R. Silva
  2021-05-11 15:44 ` Gustavo A. R. Silva
  0 siblings, 2 replies; 4+ messages in thread
From: Gustavo A. R. Silva @ 2021-02-10 22:57 UTC (permalink / raw)
  To: Stanimir Varbanov, Andy Gross, Bjorn Andersson, Mauro Carvalho Chehab
  Cc: linux-media, linux-arm-msm, linux-kernel, Gustavo A. R. Silva,
	linux-hardening

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 member in struct hfi_sys_set_property_pkt instead of
one-element array.

Also, this helps with the ongoing efforts to enable -Warray-bounds and
fix the following warnings:

drivers/media/platform/qcom/venus/hfi_cmds.c: In function ‘pkt_sys_coverage_config’:
drivers/media/platform/qcom/venus/hfi_cmds.c:57:11: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
   57 |  pkt->data[1] = mode;
      |  ~~~~~~~~~^~~

[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: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/602416da.iZqae7Dbk7nyl6OY%25lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/media/platform/qcom/venus/hfi_cmds.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.h b/drivers/media/platform/qcom/venus/hfi_cmds.h
index 83705e237f1c..327ed90a2788 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.h
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.h
@@ -68,7 +68,7 @@ struct hfi_sys_release_resource_pkt {
 struct hfi_sys_set_property_pkt {
 	struct hfi_pkt_hdr hdr;
 	u32 num_properties;
-	u32 data[1];
+	u32 data[];
 };
 
 struct hfi_sys_get_property_pkt {
-- 
2.27.0


^ permalink raw reply	[flat|nested] 4+ messages in thread

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2021-02-10 22:57 [PATCH][next] media: venus: hfi_cmds.h: Replace one-element array with flexible-array member Gustavo A. R. Silva
2021-03-04  1:42 ` Gustavo A. R. Silva
2021-05-11 15:44 ` Gustavo A. R. Silva
2021-05-12 11:37   ` Stanimir Varbanov

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