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Message-ID: <CADnq5_NuDA9tT05B0bDqfCi0v=j3emjxLGxKA6hTTuAjRoM4xA@mail.gmail.com>
Date: Fri, 22 May 2020 14:07:08 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/[radeon|amdgpu]: Replace one-element array and use
struct_size() helper
On Fri, May 22, 2020 at 1:39 PM Gustavo A. R. Silva
<gustavoars@...nel.org> wrote:
>
> The current codebase makes use of one-element arrays in the following
> form:
>
> struct something {
> int length;
> u8 data[1];
> };
>
> struct something *instance;
>
> instance = kmalloc(sizeof(*instance) + size, GFP_KERNEL);
> instance->length = size;
> memcpy(instance->data, source, size);
>
> but the preferred mechanism to declare variable-length types such as
> these ones is a flexible array member[1][2], introduced in C99:
>
> struct foo {
> int stuff;
> struct boo array[];
> };
>
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertently introduced[3] to the codebase from now on. So, replace
> the one-element array with a flexible-array member.
>
> Also, make use of the new struct_size() helper to properly calculate the
> size of struct SISLANDS_SMC_SWSTATE.
>
> This issue was found with the help of Coccinelle and, audited and fixed
> _manually_.
>
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Applied. Thanks!
Alex
> ---
> drivers/gpu/drm/amd/amdgpu/si_dpm.c | 5 ++---
> drivers/gpu/drm/amd/amdgpu/sislands_smc.h | 2 +-
> drivers/gpu/drm/radeon/si_dpm.c | 5 ++---
> 3 files changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.c b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> index c00ba4b23c9a6..0fc56c5bac080 100644
> --- a/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
> @@ -5715,10 +5715,9 @@ static int si_upload_sw_state(struct amdgpu_device *adev,
> int ret;
> u32 address = si_pi->state_table_start +
> offsetof(SISLANDS_SMC_STATETABLE, driverState);
> - u32 state_size = sizeof(SISLANDS_SMC_SWSTATE) +
> - ((new_state->performance_level_count - 1) *
> - sizeof(SISLANDS_SMC_HW_PERFORMANCE_LEVEL));
> SISLANDS_SMC_SWSTATE *smc_state = &si_pi->smc_statetable.driverState;
> + size_t state_size = struct_size(smc_state, levels,
> + new_state->performance_level_count);
>
> memset(smc_state, 0, state_size);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/sislands_smc.h b/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
> index d2930eceaf3c8..a089dbf8f7a93 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
> +++ b/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
> @@ -186,7 +186,7 @@ struct SISLANDS_SMC_SWSTATE
> uint8_t levelCount;
> uint8_t padding2;
> uint8_t padding3;
> - SISLANDS_SMC_HW_PERFORMANCE_LEVEL levels[1];
> + SISLANDS_SMC_HW_PERFORMANCE_LEVEL levels[];
> };
>
> typedef struct SISLANDS_SMC_SWSTATE SISLANDS_SMC_SWSTATE;
> diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
> index a167e1c36d243..bab01ca864c63 100644
> --- a/drivers/gpu/drm/radeon/si_dpm.c
> +++ b/drivers/gpu/drm/radeon/si_dpm.c
> @@ -5253,10 +5253,9 @@ static int si_upload_sw_state(struct radeon_device *rdev,
> int ret;
> u32 address = si_pi->state_table_start +
> offsetof(SISLANDS_SMC_STATETABLE, driverState);
> - u32 state_size = sizeof(SISLANDS_SMC_SWSTATE) +
> - ((new_state->performance_level_count - 1) *
> - sizeof(SISLANDS_SMC_HW_PERFORMANCE_LEVEL));
> SISLANDS_SMC_SWSTATE *smc_state = &si_pi->smc_statetable.driverState;
> + size_t state_size = struct_size(smc_state, levels,
> + new_state->performance_level_count);
>
> memset(smc_state, 0, state_size);
>
> --
> 2.26.2
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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