d2a704388f
event_log_record_extract_firmware_description() walks the device path of a UEFI_IMAGE_LOAD_EVENT taken from the firmware TPM2 measurement log. The per-node loop checks the remaining bytes against the node and its declared length, but never that dp->length covers the 4-byte node header offsetof(packed_EFI_DEVICE_PATH, path). For a Media/File-Path node with length 3, the file-name extraction computes dp->length - offsetof(packed_EFI_DEVICE_PATH, path) == 3 - 4, which wraps to SIZE_MAX. utf16_to_utf8() treats SIZE_MAX as unbounded and runs char16_strlen() over dp->path, reading past the log buffer; a length of 0 also leaves dp non-advancing. efi_get_boot_option() in src/shared/efi-api.c already rejects such nodes with "if (dpath->length < 4) break;"; do the same here.
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