There is a memory leak defect at line 817 in the file /masscan/src/proto-http.c.

[LuMingYinDetect]

In the file /masscan/src/proto-http.c, a pointer variable named x is defined at line 807 and a new dynamic memory area is allocated through the STRDUP function. If the if statement at line 815 returns true, the function will return at line 817, and the dynamic memory area pointed to by x is not released, resulting in a memory leak defect. It is also worth noting that even if the if statement at line 815 returns false, the function does not release the dynamic memory area pointed to by x as done at line 880, as shown in the figure below:
https://github.com/LuMingYinDetect/masscan_defects/blob/main/masscan_3.png