diff options
Diffstat (limited to 'src/class')
| -rw-r--r-- | src/class/hid/hid_host.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/class/hid/hid_host.c b/src/class/hid/hid_host.c index bd419c72d..29bcae99f 100644 --- a/src/class/hid/hid_host.c +++ b/src/class/hid/hid_host.c @@ -742,7 +742,12 @@ uint8_t tuh_hid_parse_report_descriptor(tuh_hid_report_info_t* report_info_arr, switch (tag) { case RI_GLOBAL_USAGE_PAGE: // only take in account the "usage page" before REPORT ID - if (ri_collection_depth == 0) memcpy(&info->usage_page, desc_report, TU_MIN(size, sizeof(info->usage_page))); + if (ri_collection_depth == 0) { + // zero-extend: a shorter payload must not leave a stale high byte + // from a previous usage page item in the same report + info->usage_page = 0; + memcpy(&info->usage_page, desc_report, TU_MIN(size, sizeof(info->usage_page))); + } break; case RI_GLOBAL_LOGICAL_MIN: break; |