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-rw-r--r--src/voicecall.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/voicecall.c b/src/voicecall.c
index 550b79b4..b0882391 100644
--- a/src/voicecall.c
+++ b/src/voicecall.c
@@ -1513,6 +1513,9 @@ static int voicecall_dial(struct ofono_voicecall *vc, const char *number,
if (g_slist_length(vc->call_list) >= MAX_VOICE_CALLS)
return -EPERM;
+ if (valid_ussd_string(number, vc->call_list != NULL))
+ return -EINVAL;
+
if (!valid_long_phone_number_format(number))
return -EINVAL;