When building with the gcc static analyzer (-fanalyzer) the following small leak is reported. It basically says that in CHECKED_MALLOC3 in line 998 an early return can potentially happen; but in this (rare) case the allocated memory from earlier CHECKED_MALLOC3' (line 949) is not freed.

/jdk/src/java.base/unix/native/libnet/NetworkInterface.c: In function 'addif':
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:65:13: warning: leak of 'addrP' [CWE-401] [-Wanalyzer-malloc-leak]
   65 | return ifs; /* return untouched list */ \
      | ^~~~~~
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:998:10: note: in expansion of macro 'CHECKED_MALLOC3'
  998 | CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
      | ^~~~~~~~~~~~~~~
  'addif': event 1
    |
    | 62 | _pointer = (_type)malloc(_size); \
    | | ^~~~~~~~~~~~~
    | | |
    | | (1) allocated here
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:949:5: note: in expansion of macro 'CHECKED_MALLOC3'
    | 949 | CHECKED_MALLOC3(addrP, netaddr *, sizeof(netaddr) + 2 * addr_size);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 2
    |
    | 63 | if (_pointer == NULL) { \
    | | ^
    | | |
    | | (2) assuming 'addrP' is non-NULL
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:949:5: note: in expansion of macro 'CHECKED_MALLOC3'
    | 949 | CHECKED_MALLOC3(addrP, netaddr *, sizeof(netaddr) + 2 * addr_size);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 3
    |
    | 63 | if (_pointer == NULL) { \
    | | ^
    | | |
    | | (3) following 'false' branch (when 'addrP' is non-NULL)...
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:949:5: note: in expansion of macro 'CHECKED_MALLOC3'
    | 949 | CHECKED_MALLOC3(addrP, netaddr *, sizeof(netaddr) + 2 * addr_size);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 4
    |
    | 61 | do { \
    | | ^
    | | |
    | | (4) ...to here
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:949:5: note: in expansion of macro 'CHECKED_MALLOC3'
    | 949 | CHECKED_MALLOC3(addrP, netaddr *, sizeof(netaddr) + 2 * addr_size);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': events 5-8
    |
    | 958 | if (family == AF_INET && ifr_broadaddrP != NULL) {
    | | ^
    | | |
    | | (5) following 'true' branch...
    | 959 | addrP->brdcast = (struct sockaddr *)
    | | ~~~~~
    | | |
    | | (6) ...to here
    |......
    | 967 | name_colonP = strchr(name, ':');
    | | ~~~~~~~~~~~~~~~~~
    | | |
    | | (7) when 'strchr' returns NULL
    | 968 | if (name_colonP != NULL) {
    | | ~
    | | |
    | | (8) following 'false' branch (when 'name_colonP' is NULL)...
    |
  'addif': event 9
    |
    |cc1:
    | (9): ...to here
    |
  'addif': events 10-12
    |
    | 989 | while (currif != NULL) {
    | | ^
    | | |
    | | (10) following 'false' branch (when 'currif' is NULL)...
    |......
    | 997 | if (currif == NULL) {
    | | ~~ ~
    | | | |
    | | | (12) following 'true' branch (when 'currif' is NULL)...
    | | (11) ...to here
    |
  'addif': event 13
    |
    | 61 | do { \
    | | ^~
    | | |
    | | (13) ...to here
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:998:10: note: in expansion of macro 'CHECKED_MALLOC3'
    | 998 | CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 14
    |
    | 63 | if (_pointer == NULL) { \
    | | ^
    | | |
    | | (14) following 'true' branch (when 'currif' is NULL)...
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:998:10: note: in expansion of macro 'CHECKED_MALLOC3'
    | 998 | CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 15
    |
    | 64 | JNU_ThrowOutOfMemoryError(env, "Native heap allocation failed"); \
    | | ^~~~~~~~~~~~~~~~~~~~~~~~~
    | | |
    | | (15) ...to here
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:998:10: note: in expansion of macro 'CHECKED_MALLOC3'
    | 998 | CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
    | | ^~~~~~~~~~~~~~~
    |
  'addif': event 16
    |
    | 65 | return ifs; /* return untouched list */ \
    | | ^~~~~~
    | | |
    | | (16) 'addrP' leaks here; was allocated at (1)
/jdk/src/java.base/unix/native/libnet/NetworkInterface.c:998:10: note: in expansion of macro 'CHECKED_MALLOC3'
    | 998 | CHECKED_MALLOC3(currif, netif *, sizeof(netif) + IFNAMESIZE);
    | | ^~~~~~~~~~~~~~~