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Subject: memory leak after upgrade from 1.4.3 to 1.6.0

memory leak after upgrade from 1.4.3 to 1.6.0

From: suyog jadhav <suyogjadhav_at_yahoo.com>
Date: Thu, 21 Jan 2016 08:02:59 +0000 (UTC)

Hi

we have been using libssh2 library in our project for some time. (since 1.2 release)

We remotely monitor multiple remote hosts (100+), and do following.

1)open session.
2)execute commands periodically. (e.g. each minute run iostat,vmstat)

We were using 1.4.3 version of the library until now and everything was working fine.

Recently we have upgraded library to 1.6.0 and we are seeing memory growth/leak in the process.
Our code has not changed in the library upgrade.

Our valgrind analysis shows that the leak is in the "libssh2_session_init_ex (session.c:487)" and "libssh2_channel_open_ex (channel.c:349)".

Could you please let me know if there is any change in 1.6.0 which may cause this leak.
Is there any api behavior that has changed which needs extra error handling now?
Also if you could point to a way/approach for solving this leak, it would be greatly appreciated.

Valgrind trace.

==9718== 582,541 (545,440 direct, 37,101 indirect) bytes in 10 blocks are definitely lost in loss record 642 of 645
==9718==    at 0x4A06A2E: malloc (vg_replace_malloc.c:270)
==9718==    by 0x41A830: libssh2_default_alloc (session.c:67)
==9718==    by 0x41B1CC: libssh2_session_init_ex (session.c:487)

==9718== 10,144,824 (106,640 direct, 10,038,184 indirect) bytes in 155 blocks are definitely lost in loss record 644 of 645
==9718==    at 0x4A06A2E: malloc (vg_replace_malloc.c:270)
==9718==    by 0x41A830: libssh2_default_alloc (session.c:67)
==9718==    by 0x4162A5: _libssh2_calloc (misc.c:625)
==9718==    by 0x40ACFC: _libssh2_channel_open (channel.c:160)
==9718==    by 0x40B4C4: libssh2_channel_open_ex (channel.c:349)

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Received on 2016-01-21

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