Don't allow a completely empty source arg.

2 files changed, 10 insertions, 0 deletions

diff --git a/NEWS.md b/NEWS.md
index 66b88758..0e762c62 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -26,6 +26,9 @@
  - Rsync now complains about a missing `--temp-dir` before starting any file
    transfers.
 
+ - A completely empty source arg is now a fatal error.  This doesn't change
+   the handling of implied dot-dir args such as "localhost:" and such.
+
 ### ENHANCEMENTS:
 
  - Allow `--max-alloc=0` to specify no limit to the alloc sanity check.
diff --git a/main.c b/main.c
index bfb69797..46b97b58 100644
--- a/main.c
+++ b/main.c
@@ -1482,8 +1482,15 @@ static int start_client(int argc, char *argv[])
 		char *dummy_host;
 		int dummy_port = rsync_port;
 		int i;
+		if (!argv[0][0])
+			goto invalid_empty;
 		/* For local source, extra source args must not have hostspec. */
 		for (i = 1; i < argc; i++) {
+			if (!argv[i][0]) {
+			    invalid_empty:
+				rprintf(FERROR, "Empty source arg specified.\n");
+				exit_cleanup(RERR_SYNTAX);
+			}
 			if (check_for_hostspec(argv[i], &dummy_host, &dummy_port)) {
 				rprintf(FERROR, "Unexpected remote arg: %s\n", argv[i]);
 				exit_cleanup(RERR_SYNTAX);