Coverity: submit_dmub_burst_write(): Memory - corruptions

Hello!

This is an experimental automated report about issues detected by Coverity from a scan of next-20191108 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified lines of code (noted below) that were touched by recent commits:

c264644545d2 ("drm/amd/display: Add DMUB support to DC")

Coverity reported the following:

*** CID 1487839: Memory - corruptions (OVERRUN) /drivers/gpu/drm/amd/display/dc/dc_helper.c: 76 in submit_dmub_burst_write()
70 cmd_buf->header.payload_bytes =
71 sizeof(uint32_t) * offload->reg_seq_count;
72
73 gather = ctx->dmub_srv->reg_helper_offload.gather_in_progress;
74 ctx->dmub_srv->reg_helper_offload.gather_in_progress = false;
75
vvv CID 1487839: Memory - corruptions (OVERRUN)
vvv Overrunning struct type dmub_cmd_header of 4 bytes by passing it to a function which accesses it at byte offset 63.
76 dc_dmub_srv_cmd_queue(ctx->dmub_srv, &cmd_buf->header);
77
78 ctx->dmub_srv->reg_helper_offload.gather_in_progress = gather;
79
80 memset(cmd_buf, 0, sizeof(*cmd_buf));
81

If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first):

Addresses-Coverity-ID: 1487839 ("Memory - corruptions")

Thanks for your attention!

Coverity-bot