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drm/amdgpu: Replace one-element array with flexible-array member

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[ Upstream commit 320e2590e281d0a7865e861f50155b5b435e9813 ]

One-element arrays are deprecated, and we are replacing them with
flexible array members instead. So, replace one-element array with
flexible-array member in struct _ATOM_FAKE_EDID_PATCH_RECORD and
refactor the rest of the code accordingly.

Important to mention is that doing a build before/after this patch
results in no binary output differences.

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].

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/238
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1]

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 8155566a26b8 ("drm/amdgpu: properly handle vbios fake edid sizing")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paulo Miguel Almeida 2022-10-29 14:30:44 +13:00 committed by Ksawlii
parent 03956d38af
commit 8fae68c46a
2 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
View file

@ -2113,8 +2113,11 @@ amdgpu_atombios_encoder_get_lcd_info(struct amdgpu_encoder *encoder)
}
}
record += fake_edid_record->ucFakeEDIDLength ?
fake_edid_record->ucFakeEDIDLength + 2 :
sizeof(ATOM_FAKE_EDID_PATCH_RECORD);
struct_size(fake_edid_record,
ucFakeEDIDString,
fake_edid_record->ucFakeEDIDLength) :
/* empty fake edid record must be 3 bytes long */
sizeof(ATOM_FAKE_EDID_PATCH_RECORD) + 1;
break;
case LCD_PANEL_RESOLUTION_RECORD_TYPE:
panel_res_record = (ATOM_PANEL_RESOLUTION_PATCH_RECORD *)record;

2
drivers/gpu/drm/amd/include/atombios.h
View file

@ -4107,7 +4107,7 @@ typedef struct _ATOM_FAKE_EDID_PATCH_RECORD
{
UCHAR ucRecordType;
UCHAR ucFakeEDIDLength; // = 128 means EDID length is 128 bytes, otherwise the EDID length = ucFakeEDIDLength*128
UCHAR ucFakeEDIDString[1]; // This actually has ucFakeEdidLength elements.
UCHAR ucFakeEDIDString[]; // This actually has ucFakeEdidLength elements.
} ATOM_FAKE_EDID_PATCH_RECORD;
typedef struct _ATOM_PANEL_RESOLUTION_PATCH_RECORD