Re: [PATCH v2] bugfix: hostmem: Free host_nodes list right after visited

[Eduardo Habkost]

On Thu, Dec 10, 2020 at 03:52:26PM +0800, Keqian Zhu wrote:
> In host_memory_backend_get_host_nodes, we build host_nodes
> list and output it to v (a StringOutputVisitor) but forget
> to free the list. This fixes the memory leak.
> 
> The memory leak stack:
> 
>  Direct leak of 32 byte(s) in 2 object(s) allocated from:
>     #0 0xfffda30b3393 in __interceptor_calloc 
> (/usr/lib64/libasan.so.4+0xd3393)
>     #1 0xfffda1d28b9b in g_malloc0 (/usr/lib64/libglib-2.0.so.0+0x58b9b)
>     #2 0xaaab05ca6e43 in host_memory_backend_get_host_nodes 
> backends/hostmem.c:94
>     #3 0xaaab061ddf83 in object_property_get_uint16List qom/object.c:1478
>     #4 0xaaab05866513 in query_memdev hw/core/machine-qmp-cmds.c:312
>     #5 0xaaab061d980b in do_object_child_foreach qom/object.c:1001
>     #6 0xaaab0586779b in qmp_query_memdev hw/core/machine-qmp-cmds.c:328
>     #7 0xaaab0615ed3f in qmp_marshal_query_memdev 
> qapi/qapi-commands-machine.c:327
>     #8 0xaaab0632d647 in do_qmp_dispatch qapi/qmp-dispatch.c:147
>     #9 0xaaab0632d647 in qmp_dispatch qapi/qmp-dispatch.c:190
>     #10 0xaaab0610f74b in monitor_qmp_dispatch monitor/qmp.c:120
>     #11 0xaaab0611074b in monitor_qmp_bh_dispatcher monitor/qmp.c:209
>     #12 0xaaab063caefb in aio_bh_poll util/async.c:117
>     #13 0xaaab063d30fb in aio_dispatch util/aio-posix.c:459
>     #14 0xaaab063cac8f in aio_ctx_dispatch util/async.c:268
>     #15 0xfffda1d22a6b in g_main_context_dispatch 
> (/usr/lib64/libglib-2.0.so.0+0x52a6b)
>     #16 0xaaab063d0e97 in glib_pollfds_poll util/main-loop.c:218
>     #17 0xaaab063d0e97 in os_host_main_loop_wait util/main-loop.c:241
>     #18 0xaaab063d0e97 in main_loop_wait util/main-loop.c:517
>     #19 0xaaab05c8bfa7 in main_loop /root/rpmbuild/BUILD/qemu-4.1.0/vl.c:1791
>     #20 0xaaab05713bc3 in main /root/rpmbuild/BUILD/qemu-4.1.0/vl.c:4473
>     #21 0xfffda0a83ebf in __libc_start_main (/usr/lib64/libc.so.6+0x23ebf)
>     #22 0xaaab0571ed5f  (aarch64-softmmu/qemu-system-aarch64+0x88ed5f)
>  SUMMARY: AddressSanitizer: 32 byte(s) leaked in 2 allocation(s).
> 
> Fixes: 4cf1b76bf1e2 (hostmem: add properties for NUMA memory policy)
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Tested-by: Chen Qun <kuhn.chenqun@huawei.com>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>

Queued, thanks!

-- 
Eduardo