diff options
| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2023-05-17 02:03:39 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-06-09 13:43:18 +0100 |
| commit | a0eadbe92610cfaa0f5d519778c0297564e6a3a2 (patch) | |
| tree | e7ea90b5920dbb9474a036c39747ae3c156103cd /drivers/media/platform/qcom/venus/hfi_cmds.c | |
| parent | 927e78ac8bc58155316cf6f46026e1912bbbbcfc (diff) | |
media: venus: hfi_cmds: Replace fake flex-array with flexible-array member
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@kernel.org>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/platform/qcom/venus/hfi_cmds.c')
| -rw-r--r-- | drivers/media/platform/qcom/venus/hfi_cmds.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.c b/drivers/media/platform/qcom/venus/hfi_cmds.c index bc3f8ff05840..33474f718398 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: |