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drm/dp-mst-helper: Don't use uninitialized fields of the sideband message header 

We could be using uninitialized fields of the header in
drm_dp_encode_sideband_msg_hdr(), for instance hdr->somt is set to 1 in
the first patcket but never set to 0 otherwise.

Always clear the header at the start then.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2014-07-14 12:13:18 +01:00 committed by Daniel Vetter
parent 7389ad4b65
commit bf3719c04e
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -1290,6 +1290,8 @@ static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
int len, space, idx, tosend;
int ret;
memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
txmsg->seqno = -1;
txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;