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-rw-r--r--archival/tar.c3
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)) {