From: David Weinehall <david.weinehall@linux.intel.com>
To: Imre Deak <imre.deak@intel.com>
Cc: Dave Airlie <airlied@redhat.com>, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/mst: Add range check for max_payloads during init
Date: Fri, 29 Jan 2016 15:52:50 +0200 [thread overview]
Message-ID: <20160129135250.GM3193@boom> (raw)
In-Reply-To: <1454071469-22758-2-git-send-email-imre.deak@intel.com>
On Fri, Jan 29, 2016 at 02:44:29PM +0200, Imre Deak wrote:
> max_payload is limited by the space we have in
> drm_dp_mst_topology_mgr::vcpi_mask,payload_mask. We need to track
> max_payloads+1 IDs in these masks, see drm_dp_mst_assign_payload_id().
> Add a sanity check for this.
>
> Caught by coverity.
>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: David Weinehall <david.weinehall@intel.com>
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 8f749e6..05c2702 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2847,6 +2847,9 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
> mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
> mgr->max_payloads = max_payloads;
> mgr->conn_base_id = conn_base_id;
> + if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
> + max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
> + return -EINVAL;
> mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
> if (!mgr->payloads)
> return -ENOMEM;
> --
> 2.5.0
>
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next prev parent reply other threads:[~2016-01-29 13:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 12:44 [PATCH 1/2] drm/mst: Don't ignore the MST PBN self-test result Imre Deak
2016-01-29 12:44 ` [PATCH 2/2] drm/mst: Add range check for max_payloads during init Imre Deak
2016-01-29 13:52 ` David Weinehall [this message]
2016-01-29 13:52 ` [PATCH 1/2] drm/mst: Don't ignore the MST PBN self-test result David Weinehall
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