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

From: Markus Armbruster
Subject: Re: [PATCH 1/2] block/rbd: fix memory leak in qemu_rbd_connect()
Date: Tue, 06 Apr 2021 10:22:30 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)

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

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

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