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 struct hfi_sys_set_resource_pkt, and refactor the rest of
the code, accordingly.
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].
The only binary differences seen before/after changes are the
following:
17ba: mov %rbx,%rdi
17bd: call 17c2 <pkt_sys_set_resource+0x42>
17be: R_X86_64_PLT32 __tsan_write4-0x4
- 17c2: movl $0x14,(%rbx)
+ 17c2: movl $0x10,(%rbx)
17c8: lea 0x4(%rbx),%rdi
17cc: call 17d1 <pkt_sys_set_resource+0x51>
17cd: R_X86_64_PLT32 __tsan_write4-0x4
which is expected once this accounts for the following line of code
at drivers/media/platform/qcom/venus/hfi_cmds.c:73
73 pkt->hdr.size = sizeof(*pkt);
and as *pkt is of type struct hfi_sys_set_resource_pkt, sizeof(*pkt) is
reduced by 4 bytes, due to the flex-array transformation.
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/293
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
drivers/media/platform/qcom/venus/hfi_cmds.c | 2 +-
drivers/media/platform/qcom/venus/hfi_cmds.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.c b/drivers/media/platform/qcom/venus/hfi_cmds.c
index 3f74d518ad08..7c82e212434e 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.c
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.c
@@ -83,7 +83,7 @@ int pkt_sys_set_resource(struct hfi_sys_set_resource_pkt *pkt, u32 id, u32 size,
res->size = size;
res->mem = addr;
pkt->resource_type = HFI_RESOURCE_OCMEM;
- pkt->hdr.size += sizeof(*res) - sizeof(u32);
+ pkt->hdr.size += sizeof(*res);
break;
}
case VIDC_RESOURCE_NONE:
diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.h b/drivers/media/platform/qcom/venus/hfi_cmds.h
index ba74d03eb9cd..dd9c5066442d 100644
--- a/drivers/media/platform/qcom/venus/hfi_cmds.h
+++ b/drivers/media/platform/qcom/venus/hfi_cmds.h
@@ -56,7 +56,7 @@ struct hfi_sys_set_resource_pkt {
struct hfi_pkt_hdr hdr;
u32 resource_handle;
u32 resource_type;
- u32 resource_data[1];
+ u32 resource_data[];
};
struct hfi_sys_release_resource_pkt {
--
2.34.1
