| Message ID | 20210210225720.GA13710@embeddedor |
|---|---|
| State | Accepted |
| Commit | 51bb3989c2a1c49b8cebdb753a0ab28d5a546b52 |
| Headers | show |
| Series | [next] media: venus: hfi_cmds.h: Replace one-element array with flexible-array member | expand |
Hi all, Friendly ping: who can take this, please? Thanks -- Gustavo On Wed, Feb 10, 2021 at 04:57:20PM -0600, Gustavo A. R. Silva wrote: > 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 >
Hi all, Friendly ping: We are about to be able to globally enable -Warray-bounds and, this is one of the last out-of-bounds warnings in linux-next. Could someone take this, please? Thanks -- Gustavo On 2/10/21 16:57, Gustavo A. R. Silva wrote: > 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 { >
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 {
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(-)