2 files changed, 21 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_bif_port.c b/erts/emulator/beam/erl_bif_port.c
index 27c24197ea..e4d4559f48 100644
--- a/erts/emulator/beam/erl_bif_port.c
+++ b/erts/emulator/beam/erl_bif_port.c
@@ -953,6 +953,8 @@ static char **convert_args(Eterm l)
     }
 
     n = erts_list_length(l);
+    if (n < 0)
+        return NULL;
     /* We require at least one element in argv[0] + NULL at end */
     pp = erts_alloc(ERTS_ALC_T_TMP, (n + 2) * sizeof(char **));
     pp[i++] = erts_default_arg0;
diff --git a/erts/emulator/test/port_SUITE.erl b/erts/emulator/test/port_SUITE.erl
index 3d0509a28c..c0c0470c94 100644
--- a/erts/emulator/test/port_SUITE.erl
+++ b/erts/emulator/test/port_SUITE.erl
@@ -86,6 +86,7 @@
 	 name1/1,
 	 t_binary/1, parallell/1, t_exit/1,
 	 env/1, bad_env/1, cd/1, exit_status/1,
+	 bad_args/1,
 	 tps_16_bytes/1, tps_1K/1, line/1, stderr_to_stdout/1,
 	 otp_3906/1, otp_4389/1, win_massive/1, win_massive_client/1,
 	 mix_up_ports/1, otp_5112/1, otp_5119/1, otp_6224/1,
@@ -112,6 +113,7 @@ all() ->
      {group, multiple_packets}, parallell, dying_port,
      port_program_with_path, open_input_file_port,
      open_output_file_port, name1, env, bad_env, cd,
+     bad_args,
      exit_status, iter_max_ports, t_exit, {group, tps}, line,
      stderr_to_stdout, otp_3906, otp_4389, win_massive,
      mix_up_ports, otp_5112, otp_5119,
@@ -923,6 +925,23 @@ try_bad_env(Env) ->
 	error:badarg -> ok
     end.
 
+%%  Test bad 'args' options.
+bad_args(Config) when is_list(Config) ->
+    try_bad_args({args, [self()]}),
+    try_bad_args({args, ["head" | "tail"]}),
+    try_bad_args({args, ["head", "body" | "tail"]}),
+    try_bad_args({args, [<<"head">>, <<"body">> | <<"tail">>]}),
+    try_bad_args({args, not_a_list}),
+    try_bad_args({args, ["string",<<"binary">>, 1472, "string"]}),
+    try_bad_args({args, ["string",<<"binary">>], "element #3"}),
+    ok.
+
+try_bad_args(Args) ->
+    badarg = try open_port({spawn_executable,"ls"}, [Args])
+	     catch
+		 error:badarg -> badarg
+	     end.
+
 %% 'cd' option
 %% (Can perhaps be made smaller by calling the other utility functions
 %% in this module.)