diff options
| -rw-r--r-- | archival/tar.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/archival/tar.c b/archival/tar.c index 9ef616b92..c8a2bd385 100644 --- a/archival/tar.c +++ b/archival/tar.c @@ -662,6 +662,9 @@ int tar_main(int argc, char **argv) if(opt & 0x80000000UL) bb_show_usage(); ctx_flag = opt & (CTX_CREATE | CTX_TEST | CTX_EXTRACT); + if (ctx_flag == 0) { + bb_show_usage(); + } if(ctx_flag & CTX_TEST) { if ((tar_handle->action_header == header_list) || (tar_handle->action_header == header_verbose_list)) { |