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authorImre Deak <imre.deak@intel.com>2016-01-29 14:44:29 +0200
committerDave Airlie <airlied@redhat.com>2016-02-05 15:23:48 +1000
commit4d6a10da79fddcf7460299ab390da74ef2b592f6 (patch)
tree1a09af919fb8ab10db0d84a0b1440883ee89f913 /drivers
parent441388a8a73f905359e60518cfc18eca6aed2b6a (diff)
downloadlinux-4d6a10da79fddcf7460299ab390da74ef2b592f6.tar.bz2
drm/mst: Add range check for max_payloads during init
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> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/drm_dp_mst_topology.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 2b7c2f068834..0680e7aecac4 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2848,6 +2848,9 @@ 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;