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 --- drivers/gpu/drm/drm_dp_mst_topology.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 813b8d1..618526d 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -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;
On Mon, Jul 14, 2014 at 12:13:18PM +0100, Damien Lespiau wrote:
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
Both pulled into topic/core-stuff with the summary tag bikeshedded to drm/dp-helper. -Daniel
drivers/gpu/drm/drm_dp_mst_topology.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 813b8d1..618526d 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -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;
-- 1.8.3.1
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