* Re: [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get
2020-06-03 7:03 [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get Pan Nengyuan
@ 2020-06-03 6:51 ` Philippe Mathieu-Daudé
2020-06-03 7:51 ` Pan Nengyuan
2020-06-03 15:22 ` Li Qiang
2020-06-17 16:23 ` Dr. David Alan Gilbert
2 siblings, 1 reply; 5+ messages in thread
From: Philippe Mathieu-Daudé @ 2020-06-03 6:51 UTC (permalink / raw)
To: Pan Nengyuan, pbonzini, berrange, ehabkost,
Dr. David Alan Gilbert, Markus Armbruster
Cc: zhang.zhanghailiang, qemu-devel, euler.robot
Hi Pan,
On 6/3/20 9:03 AM, Pan Nengyuan wrote:
> 'obj' forgot to free at the end of hmp_qom_get(). Fix that.
>
> The leak stack:
> Direct leak of 40 byte(s) in 1 object(s) allocated from:
> #0 0x7f4e3a779ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
> #1 0x7f4e398f91d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
> #2 0x55c9fd9a3999 in qstring_from_substr /build/qemu/src/qobject/qstring.c:45
> #3 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:175
> #4 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:168
> #5 0x55c9fd88b34d in visit_type_str /build/qemu/src/qapi/qapi-visit-core.c:308
> #6 0x55c9fd59aa6b in property_get_str /build/qemu/src/qom/object.c:2064
> #7 0x55c9fd5adb8a in object_property_get_qobject /build/qemu/src/qom/qom-qobject.c:38
> #8 0x55c9fd4a029d in hmp_qom_get /build/qemu/src/qom/qom-hmp-cmds.c:66
>
> Fixes: 89cf4fe34f4
When you fix a bug in a specific commit, please Cc the commit author and
the reviewers, so they have a chance to 1/ review your fix and 2/ learn
from their mistake.
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
> ---
> qom/qom-hmp-cmds.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
> index f704b6949a..3d2a23292d 100644
> --- a/qom/qom-hmp-cmds.c
> +++ b/qom/qom-hmp-cmds.c
> @@ -71,6 +71,7 @@ void hmp_qom_get(Monitor *mon, const QDict *qdict)
> qobject_unref(str);
> }
>
> + qobject_unref(obj);
The object_resolve_path() documentation is not clear about that...
Can we get the documentation clarified?
> hmp_handle_error(mon, err);
> }
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get
@ 2020-06-03 7:03 Pan Nengyuan
2020-06-03 6:51 ` Philippe Mathieu-Daudé
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Pan Nengyuan @ 2020-06-03 7:03 UTC (permalink / raw)
To: pbonzini, berrange, ehabkost
Cc: euler.robot, Pan Nengyuan, qemu-devel, zhang.zhanghailiang
'obj' forgot to free at the end of hmp_qom_get(). Fix that.
The leak stack:
Direct leak of 40 byte(s) in 1 object(s) allocated from:
#0 0x7f4e3a779ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
#1 0x7f4e398f91d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
#2 0x55c9fd9a3999 in qstring_from_substr /build/qemu/src/qobject/qstring.c:45
#3 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:175
#4 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:168
#5 0x55c9fd88b34d in visit_type_str /build/qemu/src/qapi/qapi-visit-core.c:308
#6 0x55c9fd59aa6b in property_get_str /build/qemu/src/qom/object.c:2064
#7 0x55c9fd5adb8a in object_property_get_qobject /build/qemu/src/qom/qom-qobject.c:38
#8 0x55c9fd4a029d in hmp_qom_get /build/qemu/src/qom/qom-hmp-cmds.c:66
Fixes: 89cf4fe34f4
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
---
qom/qom-hmp-cmds.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
index f704b6949a..3d2a23292d 100644
--- a/qom/qom-hmp-cmds.c
+++ b/qom/qom-hmp-cmds.c
@@ -71,6 +71,7 @@ void hmp_qom_get(Monitor *mon, const QDict *qdict)
qobject_unref(str);
}
+ qobject_unref(obj);
hmp_handle_error(mon, err);
}
--
2.18.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get
2020-06-03 6:51 ` Philippe Mathieu-Daudé
@ 2020-06-03 7:51 ` Pan Nengyuan
0 siblings, 0 replies; 5+ messages in thread
From: Pan Nengyuan @ 2020-06-03 7:51 UTC (permalink / raw)
To: Philippe Mathieu-Daudé,
pbonzini, berrange, ehabkost, Dr. David Alan Gilbert,
Markus Armbruster
Cc: zhang.zhanghailiang, qemu-devel, euler.robot
On 6/3/2020 2:51 PM, Philippe Mathieu-Daudé wrote:
> Hi Pan,
>
> On 6/3/20 9:03 AM, Pan Nengyuan wrote:
>> 'obj' forgot to free at the end of hmp_qom_get(). Fix that.
>>
>> The leak stack:
>> Direct leak of 40 byte(s) in 1 object(s) allocated from:
>> #0 0x7f4e3a779ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
>> #1 0x7f4e398f91d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
>> #2 0x55c9fd9a3999 in qstring_from_substr /build/qemu/src/qobject/qstring.c:45
>> #3 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:175
>> #4 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:168
>> #5 0x55c9fd88b34d in visit_type_str /build/qemu/src/qapi/qapi-visit-core.c:308
>> #6 0x55c9fd59aa6b in property_get_str /build/qemu/src/qom/object.c:2064
>> #7 0x55c9fd5adb8a in object_property_get_qobject /build/qemu/src/qom/qom-qobject.c:38
>> #8 0x55c9fd4a029d in hmp_qom_get /build/qemu/src/qom/qom-hmp-cmds.c:66
>>
>> Fixes: 89cf4fe34f4
>
> When you fix a bug in a specific commit, please Cc the commit author and
> the reviewers, so they have a chance to 1/ review your fix and 2/ learn
> from their mistake.
Ok, I will do next time.
>
>> Reported-by: Euler Robot <euler.robot@huawei.com>
>> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
>> ---
>> qom/qom-hmp-cmds.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
>> index f704b6949a..3d2a23292d 100644
>> --- a/qom/qom-hmp-cmds.c
>> +++ b/qom/qom-hmp-cmds.c
>> @@ -71,6 +71,7 @@ void hmp_qom_get(Monitor *mon, const QDict *qdict)
>> qobject_unref(str);
>> }
>>
>> + qobject_unref(obj);
>
> The object_resolve_path() documentation is not clear about that...
> Can we get the documentation clarified?
I'm not sure why is object_resolve_path().
In this case, 'obj' is returned from object_property_get_qobject() in qmp_qom_get().
Do you mean document object_property_get_qobject() to make it more clear?
Like:
- The returned object has a reference count of 1, and will be freed when the last reference is dropped.
Thanks.
>
>> hmp_handle_error(mon, err);
>> }
>>
>>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get
2020-06-03 7:03 [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get Pan Nengyuan
2020-06-03 6:51 ` Philippe Mathieu-Daudé
@ 2020-06-03 15:22 ` Li Qiang
2020-06-17 16:23 ` Dr. David Alan Gilbert
2 siblings, 0 replies; 5+ messages in thread
From: Li Qiang @ 2020-06-03 15:22 UTC (permalink / raw)
To: Pan Nengyuan
Cc: Daniel P. Berrange, zhanghailiang, Qemu Developers, euler.robot,
Paolo Bonzini, Eduardo Habkost
[-- Attachment #1: Type: text/plain, Size: 1788 bytes --]
Pan Nengyuan <pannengyuan@huawei.com> 于2020年6月3日周三 下午2:17写道:
> 'obj' forgot to free at the end of hmp_qom_get(). Fix that.
>
> The leak stack:
> Direct leak of 40 byte(s) in 1 object(s) allocated from:
> #0 0x7f4e3a779ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
> #1 0x7f4e398f91d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
> #2 0x55c9fd9a3999 in qstring_from_substr
> /build/qemu/src/qobject/qstring.c:45
> #3 0x55c9fd894bd3 in qobject_output_type_str
> /build/qemu/src/qapi/qobject-output-visitor.c:175
> #4 0x55c9fd894bd3 in qobject_output_type_str
> /build/qemu/src/qapi/qobject-output-visitor.c:168
> #5 0x55c9fd88b34d in visit_type_str
> /build/qemu/src/qapi/qapi-visit-core.c:308
> #6 0x55c9fd59aa6b in property_get_str /build/qemu/src/qom/object.c:2064
> #7 0x55c9fd5adb8a in object_property_get_qobject
> /build/qemu/src/qom/qom-qobject.c:38
> #8 0x55c9fd4a029d in hmp_qom_get /build/qemu/src/qom/qom-hmp-cmds.c:66
>
> Fixes: 89cf4fe34f4
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
>
This can be tested by compile qemu with '-fsanitize=address' cflags and:
make check
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Tested-by: Li Qiang <liq3ea@gmail.com>
Li Qiang
> ---
> qom/qom-hmp-cmds.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
> index f704b6949a..3d2a23292d 100644
> --- a/qom/qom-hmp-cmds.c
> +++ b/qom/qom-hmp-cmds.c
> @@ -71,6 +71,7 @@ void hmp_qom_get(Monitor *mon, const QDict *qdict)
> qobject_unref(str);
> }
>
> + qobject_unref(obj);
> hmp_handle_error(mon, err);
> }
>
> --
> 2.18.2
>
>
>
[-- Attachment #2: Type: text/html, Size: 2666 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get
2020-06-03 7:03 [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get Pan Nengyuan
2020-06-03 6:51 ` Philippe Mathieu-Daudé
2020-06-03 15:22 ` Li Qiang
@ 2020-06-17 16:23 ` Dr. David Alan Gilbert
2 siblings, 0 replies; 5+ messages in thread
From: Dr. David Alan Gilbert @ 2020-06-17 16:23 UTC (permalink / raw)
To: Pan Nengyuan
Cc: berrange, zhang.zhanghailiang, qemu-devel, euler.robot, pbonzini,
ehabkost
* Pan Nengyuan (pannengyuan@huawei.com) wrote:
> 'obj' forgot to free at the end of hmp_qom_get(). Fix that.
>
> The leak stack:
> Direct leak of 40 byte(s) in 1 object(s) allocated from:
> #0 0x7f4e3a779ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
> #1 0x7f4e398f91d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
> #2 0x55c9fd9a3999 in qstring_from_substr /build/qemu/src/qobject/qstring.c:45
> #3 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:175
> #4 0x55c9fd894bd3 in qobject_output_type_str /build/qemu/src/qapi/qobject-output-visitor.c:168
> #5 0x55c9fd88b34d in visit_type_str /build/qemu/src/qapi/qapi-visit-core.c:308
> #6 0x55c9fd59aa6b in property_get_str /build/qemu/src/qom/object.c:2064
> #7 0x55c9fd5adb8a in object_property_get_qobject /build/qemu/src/qom/qom-qobject.c:38
> #8 0x55c9fd4a029d in hmp_qom_get /build/qemu/src/qom/qom-hmp-cmds.c:66
>
> Fixes: 89cf4fe34f4
> Reported-by: Euler Robot <euler.robot@huawei.com>
> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
Queued.
> ---
> qom/qom-hmp-cmds.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c
> index f704b6949a..3d2a23292d 100644
> --- a/qom/qom-hmp-cmds.c
> +++ b/qom/qom-hmp-cmds.c
> @@ -71,6 +71,7 @@ void hmp_qom_get(Monitor *mon, const QDict *qdict)
> qobject_unref(str);
> }
>
> + qobject_unref(obj);
> hmp_handle_error(mon, err);
> }
>
> --
> 2.18.2
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-06-03 7:03 [PATCH] qom-hmp-cmds: fix a memleak in hmp_qom_get Pan Nengyuan
2020-06-03 6:51 ` Philippe Mathieu-Daudé
2020-06-03 7:51 ` Pan Nengyuan
2020-06-03 15:22 ` Li Qiang
2020-06-17 16:23 ` Dr. David Alan Gilbert
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