| 2017-05-15 15:12:34 |
Sylvain Trinquet |
description |
It seems that there is a memory leak in the libnl-genl-3.0 library.
The memory-leak can be seen when the function genl_ctrl_resolve() fails.
It seems that this function copy a buffer and forget to deallocate it properly:
258 cb = nl_cb_clone(orig); // buffer copied not freed
--------------------------------------------------------------------------------------------
The following attached source-code can help you to reproduce this behavior on Ubuntu 14.04.
It forces an issue on the genl_ctrl_resolve by asking an unknown netlink-family.
To compile program:
g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
To detect memory-leak using Valgrind:
valgrind --leak-check=full ./main
--------------------------------------------------------------------------------------------
Executing it on Debian 8.0 shows "no memory leak":
sylvain@debian:~/test$ lsb_release -rd
Description: Debian GNU/Linux 8.8 (jessie)
Release: 8.8
sylvain@debian:~/test$ g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
sylvain@debian:~/test$ valgrind --leak-check=full ./main
==26390== Memcheck, a memory error detector
==26390== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==26390== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==26390== Command: ./main
==26390==
start test
error: can't retrieve the netlink-family id
end test
==26390==
==26390== HEAP SUMMARY:
==26390== in use at exit: 0 bytes in 0 blocks
==26390== total heap usage: 13 allocs, 13 frees, 22,142 bytes allocated
==26390==
==26390== All heap blocks were freed -- no leaks are possible
==26390==
==26390== For counts of detected and suppressed errors, rerun with: -v
==26390== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
--------------------------------------------------------------------------------------------
Executing it on Ubuntu 14.04 shows a memory leak:
ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 14.04.5 LTS
Release: 14.04
ubuntu@ubuntu:~$ g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
ubuntu@ubuntu:~$ valgrind --leak-check=full ./main
==37377== Memcheck, a memory error detector
==37377== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==37377== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==37377== Command: ./main
==37377==
start test
error: can't retrieve the netlink-family id
end test
==37377==
==37377== HEAP SUMMARY:
==37377== in use at exit: 224 bytes in 1 blocks
==37377== total heap usage: 13 allocs, 12 frees, 22,142 bytes allocated
==37377==
==37377== 224 bytes in 1 blocks are definitely lost in loss record 1 of 1
==37377== at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==37377== by 0x5048FAA: nl_cb_alloc (in /lib/x86_64-linux-gnu/libnl-3.so.200.16.1)
==37377== by 0x504CB1E: nl_socket_alloc (in /lib/x86_64-linux-gnu/libnl-3.so.200.16.1)
==37377== by 0x4012E3: A::Init() (in /home/ubuntu/main)
==37377== by 0x401189: main (in /home/ubuntu/main)
==37377==
==37377== LEAK SUMMARY:
==37377== definitely lost: 224 bytes in 1 blocks
==37377== indirectly lost: 0 bytes in 0 blocks
==37377== possibly lost: 0 bytes in 0 blocks
==37377== still reachable: 0 bytes in 0 blocks
==37377== suppressed: 0 bytes in 0 blocks
==37377==
==37377== For counts of detected and suppressed errors, rerun with: -v
==37377== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Thanks,
Sylvain Trinquet |
It seems that there is a memory leak in the libnl-genl-3.0 library.
The memory-leak can be seen when the function genl_ctrl_resolve() fails.
It seems that this function copy a buffer and forget to deallocate it properly:
258 cb = nl_cb_clone(orig); // buffer copied not freed
-----------------------------------------------------------------------------
The following attached source-code can help you to reproduce this behavior on Ubuntu 14.04.
It forces an issue on the genl_ctrl_resolve by asking an unknown netlink-family.
To compile program:
g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
To detect memory-leak using Valgrind:
valgrind --leak-check=full ./main
-----------------------------------------------------------------------------
Executing it on Debian 8.0 shows "no memory leak":
sylvain@debian:~/test$ lsb_release -rd
Description: Debian GNU/Linux 8.8 (jessie)
Release: 8.8
sylvain@debian:~/test$ g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
sylvain@debian:~/test$ valgrind --leak-check=full ./main
==26390== Memcheck, a memory error detector
==26390== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==26390== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==26390== Command: ./main
==26390==
start test
error: can't retrieve the netlink-family id
end test
==26390==
==26390== HEAP SUMMARY:
==26390== in use at exit: 0 bytes in 0 blocks
==26390== total heap usage: 13 allocs, 13 frees, 22,142 bytes allocated
==26390==
==26390== All heap blocks were freed -- no leaks are possible
==26390==
==26390== For counts of detected and suppressed errors, rerun with: -v
==26390== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
-----------------------------------------------------------------------------
Executing it on Ubuntu 14.04 shows a memory leak:
ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 14.04.5 LTS
Release: 14.04
ubuntu@ubuntu:~$ g++ -std=c++11 main.cpp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) -o main
ubuntu@ubuntu:~$ valgrind --leak-check=full ./main
==37377== Memcheck, a memory error detector
==37377== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==37377== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==37377== Command: ./main
==37377==
start test
error: can't retrieve the netlink-family id
end test
==37377==
==37377== HEAP SUMMARY:
==37377== in use at exit: 224 bytes in 1 blocks
==37377== total heap usage: 13 allocs, 12 frees, 22,142 bytes allocated
==37377==
==37377== 224 bytes in 1 blocks are definitely lost in loss record 1 of 1
==37377== at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==37377== by 0x5048FAA: nl_cb_alloc (in /lib/x86_64-linux-gnu/libnl-3.so.200.16.1)
==37377== by 0x504CB1E: nl_socket_alloc (in /lib/x86_64-linux-gnu/libnl-3.so.200.16.1)
==37377== by 0x4012E3: A::Init() (in /home/ubuntu/main)
==37377== by 0x401189: main (in /home/ubuntu/main)
==37377==
==37377== LEAK SUMMARY:
==37377== definitely lost: 224 bytes in 1 blocks
==37377== indirectly lost: 0 bytes in 0 blocks
==37377== possibly lost: 0 bytes in 0 blocks
==37377== still reachable: 0 bytes in 0 blocks
==37377== suppressed: 0 bytes in 0 blocks
==37377==
==37377== For counts of detected and suppressed errors, rerun with: -v
==37377== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Thanks,
Sylvain Trinquet |
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