linux-kernel - Re: [PATCH 4.19 1/1] drm/amdkfd: Check for null pointer after calling kmemdup

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Message-ID: <Y7Vz8mm0X+1h844b@kroah.com>
Date:   Wed, 4 Jan 2023 13:41:22 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dragos-Marian Panait <dragos.panait@...driver.com>
Cc:     stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4.19 1/1] drm/amdkfd: Check for null pointer after
 calling kmemdup

On Tue, Jan 03, 2023 at 08:43:08PM +0200, Dragos-Marian Panait wrote:
> From: Jiasheng Jiang <jiasheng@...as.ac.cn>
> 
> [ Upstream commit abfaf0eee97925905e742aa3b0b72e04a918fa9e ]
> 
> As the possible failure of the allocation, kmemdup() may return NULL
> pointer.
> Therefore, it should be better to check the 'props2' in order to prevent
> the dereference of NULL pointer.
> 
> Fixes: 3a87177eb141 ("drm/amdkfd: Add topology support for dGPUs")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
> Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Dragos-Marian Panait <dragos.panait@...driver.com>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 3 +++
>  1 file changed, 3 insertions(+)

For obvious reasons, I can't take a patch for 4.19.y and not newer
kernel releases, right?

Please provide backports for all kernels if you really need to see this
merged.  And note, it's not a real bug at all, and given that a CVE was
allocated for it that makes me want to even more reject it to show the
whole folly of that mess.

thanks,

greg k-h