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Message-ID: <Y1tkWdwPUp+UdpM0@mail.google.com> Date: Fri, 28 Oct 2022 18:10:49 +1300 From: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com> To: Alex Deucher <alexander.deucher@....com>, Christian König <christian.koenig@....com>, "Pan, Xinhui" <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Hans de Goede <hdegoede@...hat.com>, Grigory Vasilyev <h0tc0d3@...il.com>, Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>, Claudio Suarez <cssk@...-c.es>, Slark Xiao <slark_xiao@....com>, Rongguang Wei <weirongguang@...inos.cn>, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] [next] drm/amdgpu: Replace one-element array with flexible-array member 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. 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@...il.com> --- drivers/gpu/drm/amd/amdgpu/atombios_encoders.c | 10 +++++++--- drivers/gpu/drm/amd/include/atombios.h | 2 +- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c index 6be9ac2b9c5b..6b5abf1249db 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c @@ -2079,10 +2079,14 @@ amdgpu_atombios_encoder_get_lcd_info(struct amdgpu_encoder *encoder) } else kfree(edid); } + + record += struct_size(fake_edid_record, + ucFakeEDIDString, + fake_edid_record->ucFakeEDIDLength); + } else { + /* empty fake edid record must be 3 bytes long */ + record += sizeof(ATOM_FAKE_EDID_PATCH_RECORD) + 1; } - record += fake_edid_record->ucFakeEDIDLength ? - fake_edid_record->ucFakeEDIDLength + 2 : - sizeof(ATOM_FAKE_EDID_PATCH_RECORD); break; case LCD_PANEL_RESOLUTION_RECORD_TYPE: panel_res_record = (ATOM_PANEL_RESOLUTION_PATCH_RECORD *)record; diff --git a/drivers/gpu/drm/amd/include/atombios.h b/drivers/gpu/drm/amd/include/atombios.h index 15943bc21bc5..b5b1d073f8e2 100644 --- a/drivers/gpu/drm/amd/include/atombios.h +++ b/drivers/gpu/drm/amd/include/atombios.h @@ -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 -- 2.37.3
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