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Re: [PATCH 1/2] block/rbd: fix memory leak in qemu_rbd_connect()

From: Stefano Garzarella
Subject: Re: [PATCH 1/2] block/rbd: fix memory leak in qemu_rbd_connect()
Date: Thu, 8 Apr 2021 09:49:46 +0200

On Tue, Apr 06, 2021 at 10:22:30AM +0200, Markus Armbruster wrote:
Stefano Garzarella <sgarzare@redhat.com> writes:

In qemu_rbd_connect(), 'mon_host' is allocated by qemu_rbd_mon_host()
using g_strjoinv(), but it's only freed in the error path, leaking
memory in the success path as reported by valgrind:

  80 bytes in 4 blocks are definitely lost in loss record 5,028 of 6,516
     at 0x4839809: malloc (vg_replace_malloc.c:307)
     by 0x5315BB8: g_malloc (in /usr/lib64/libglib-2.0.so.0.6600.8)
     by 0x532B6FF: g_strjoinv (in /usr/lib64/libglib-2.0.so.0.6600.8)
     by 0x87D07E: qemu_rbd_mon_host (rbd.c:538)
     by 0x87D07E: qemu_rbd_connect (rbd.c:562)
     by 0x87E1CE: qemu_rbd_open (rbd.c:740)
     by 0x840EB1: bdrv_open_driver (block.c:1528)
     by 0x8453A9: bdrv_open_common (block.c:1802)
     by 0x8453A9: bdrv_open_inherit (block.c:3444)
     by 0x8464C2: bdrv_open (block.c:3537)
     by 0x8108CD: qmp_blockdev_add (blockdev.c:3569)
     by 0x8EA61B: qmp_marshal_blockdev_add (qapi-commands-block-core.c:1086)
     by 0x90B528: do_qmp_dispatch_bh (qmp-dispatch.c:131)
     by 0x907EA4: aio_bh_poll (async.c:164)

Fix freeing 'mon_host' also when qemu_rbd_connect() ends correctly.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

I believe this
Fixes: 0a55679b4a5061f4d74bdb1a0e81611ba3390b00

Yep :-)

Reviewed-by: Markus Armbruster <armbru@redhat.com>


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