linux-kernel - Re: [PATCH] drm/client: Fix error code in drm_client_buffer_vmap

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Message-ID: <759f771d-9d5b-4fbc-be96-27c2e53a0981@suse.de>
Date: Mon, 29 Jul 2024 08:48:35 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Zack Rusin <zack.rusin@...adcom.com>,
 Christian König <christian.koenig@....com>,
 Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] drm/client: Fix error code in
 drm_client_buffer_vmap_local()



Am 24.07.24 um 18:09 schrieb Dan Carpenter:
> This function accidentally returns zero/success on the failure path.
> It leads to locking issues and an uninitialized *map_copy in the
> caller.
>
> Fixes: b4b0193e83cb ("drm/fbdev-generic: Fix locking with drm_client_buffer_vmap_local()")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/gpu/drm/drm_client.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
> index 2803ac111bbd..bfedcbf516db 100644
> --- a/drivers/gpu/drm/drm_client.c
> +++ b/drivers/gpu/drm/drm_client.c
> @@ -355,7 +355,7 @@ int drm_client_buffer_vmap_local(struct drm_client_buffer *buffer,
>   
>   err_drm_gem_vmap_unlocked:
>   	drm_gem_unlock(gem);
> -	return 0;
> +	return ret;
>   }
>   EXPORT_SYMBOL(drm_client_buffer_vmap_local);
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)