linux-kernel - Re: [PATCH V3 1/2] drm/radeon: Fix integer overflow in radeon_cs_parser

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Message-ID: <62ae58cb-9fec-37ca-fd40-12bf0c1c5ba3@amd.com>
Date:   Wed, 19 Apr 2023 14:23:49 +0200
From:   Christian König <christian.koenig@....com>
To:     hackyzh002 <hackyzh002@...il.com>, alexander.deucher@....com
Cc:     Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        sumit.semwal@...aro.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH V3 1/2] drm/radeon: Fix integer overflow in
 radeon_cs_parser_init

Am 19.04.23 um 14:20 schrieb hackyzh002:
> The type of size is unsigned, if size is 0x40000000, there will be an
> integer overflow, size will be zero after size *= sizeof(uint32_t),
> will cause uninitialized memory to be referenced later
>
> Signed-off-by: hackyzh002 <hackyzh002@...il.com>

Reviewed-by: Christian König <christian.koenig@....com> for the series.

> ---
>   drivers/gpu/drm/radeon/radeon_cs.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
> index 46a27ebf4..a6700d727 100644
> --- a/drivers/gpu/drm/radeon/radeon_cs.c
> +++ b/drivers/gpu/drm/radeon/radeon_cs.c
> @@ -270,7 +270,8 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
>   {
>   	struct drm_radeon_cs *cs = data;
>   	uint64_t *chunk_array_ptr;
> -	unsigned size, i;
> +	u64 size;
> +	unsigned i;
>   	u32 ring = RADEON_CS_RING_GFX;
>   	s32 priority = 0;
>