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-rw-r--r--src/lib/protocols/thunder.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/protocols/thunder.c b/src/lib/protocols/thunder.c
index 30194d153..4d477499d 100644
--- a/src/lib/protocols/thunder.c
+++ b/src/lib/protocols/thunder.c
@@ -118,6 +118,7 @@ void ndpi_int_search_thunder_tcp(struct ndpi_detection_module_struct
packet->content_line.len == 24 &&
memcmp(packet->content_line.ptr, "application/octet-stream",
24) == 0 && packet->empty_line_position_set < (packet->payload_packet_len - 8)
+ && packet->payload_packet_len > (packet->empty_line_position + 5)
&& packet->payload[packet->empty_line_position + 2] >= 0x30
&& packet->payload[packet->empty_line_position + 2] < 0x40
&& packet->payload[packet->empty_line_position + 3] == 0x00