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Message-ID: <875xtwdone.fsf@intel.com>
Date: Wed, 26 Jun 2024 12:44:21 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Ma Ke <make24@...as.ac.cn>, kherbst@...hat.com, lyude@...hat.com,
dakr@...hat.com, airlied@...il.com, daniel@...ll.ch
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Ma Ke <make24@...as.ac.cn>
Subject: Re: [PATCH] drm/nouveau: fix null pointer dereference in
nouveau_connector_get_modes
On Wed, 26 Jun 2024, Ma Ke <make24@...as.ac.cn> wrote:
> In nouveau_connector_get_modes(), the return value of drm_mode_duplicate()
> is assigned to mode, which will lead to a possible NULL pointer
> dereference on failure of drm_mode_duplicate(). Add a check to avoid npd.
>
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
> drivers/gpu/drm/nouveau/nouveau_connector.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 856b3ef5edb8..010eed56b14d 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -1001,6 +1001,8 @@ nouveau_connector_get_modes(struct drm_connector *connector)
> struct drm_display_mode *mode;
>
> mode = drm_mode_duplicate(dev, nv_connector->native_mode);
> + if (!mode)
> + return -ENOMEM;
Do not return negative values from .get_modes().
BR,
Jani.
> drm_mode_probed_add(connector, mode);
> ret = 1;
> }
--
Jani Nikula, Intel
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