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-rw-r--r--erts/emulator/beam/erl_bif_port.c2
1 files changed, 2 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;