Re: [PATCH V2] throttle-groups: fix memory leak in throttle_group_set_limit:

[Max Reitz]

On 27.11.19 07:20, address@hidden wrote:
> From: PanNengyuan <address@hidden>
> 
> This avoid a memory leak when qom-set is called to set throttle_group
> limits, here is an easy way to reproduce:
> 
> 1. run qemu-iotests as follow and check the result with asan:
>        ./check -qcow2 184
> 
> Following is the asan output backtrack:
> Direct leak of 912 byte(s) in 3 object(s) allocated from:
>     #0 0xffff8d7ab3c3 in __interceptor_calloc   (/lib64/libasan.so.4+0xd33c3)
>     #1 0xffff8d4c31cb in g_malloc0   (/lib64/libglib-2.0.so.0+0x571cb)
>     #2 0x190c857 in qobject_input_start_struct  
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/qapi/qobject-input-visitor.c:295
>     #3 0x19070df in visit_start_struct   
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/qapi/qapi-visit-core.c:49
>     #4 0x1948b87 in visit_type_ThrottleLimits   
> qapi/qapi-visit-block-core.c:3759
>     #5 0x17e4aa3 in throttle_group_set_limits   
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/block/throttle-groups.c:900
>     #6 0x1650eff in object_property_set     
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/object.c:1272
>     #7 0x1658517 in object_property_set_qobject   
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/qom-qobject.c:26
>     #8 0x15880bb in qmp_qom_set  
> /mnt/sdc/qemu-master/qemu-4.2.0-rc0/qom/qom-qmp-cmds.c:74
>     #9 0x157e3e3 in qmp_marshal_qom_set  qapi/qapi-commands-qom.c:154
> 
> Reported-by: Euler Robot <address@hidden>
> Signed-off-by: PanNengyuan <address@hidden>
> ---
> Changes v2 to v1:
> - remove unused var 'arg' (suggested by Alberto Garcia)
> ---
>  block/throttle-groups.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Thanks, applied to my block-next branch for 5.0:

https://git.xanclic.moe/XanClic/qemu/commits/branch/block-next

Max

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