There is a memory leak defect at line 749 in the file /masscan/src/proto-http.c.

[LuMingYinDetect]

In the file /masscan/src/proto-http.c, a pointer variable named banner1 is defined at line 715. At line 726, a new dynamic memory area is allocated to this variable through the function banner1_create. If the if statement at line 747 returns true, the function will return at line 749, thus skipping the memory release operation for the dynamic memory area pointed to by banner1 at line 756, resulting in a memory leak defect, as shown in the figure below:
https://github.com/LuMingYinDetect/masscan_defects/blob/main/masscan_2.png