Re: [PATCH v2] scsi-disk: define props in scsi_block_disk to avoid memleaks

[Paolo Bonzini]

On 14/01/20 10:16, address@hidden wrote:
> From: Pan Nengyuan <address@hidden>
> 
> scsi_block_realize() use scsi_realize() to init some props, but
> these props is not defined in scsi_block_disk_properties, so they will
> not be freed.
> 
> This patch defines these prop in scsi_block_disk_properties and aslo
> calls scsi_unrealize to avoid memleaks, the leak stack as
> follow(it's easy to reproduce by attaching/detaching scsi-block-disks):
> 
> =================================================================
> ==qemu-system-x86_64==32195==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 57 byte(s) in 3 object(s) allocated from:
>   #0 0x7f19f8bed768 (/lib64/libasan.so.5+0xef768)  ??:?
>   #1 0x7f19f64d9445 (/lib64/libglib-2.0.so.0+0x52445)  ??:?
>   #2 0x7f19f64f2d92 (/lib64/libglib-2.0.so.0+0x6bd92)  ??:?
>   #3 0x55975366e596 (qemu-system-x86_64+0x35c0596)  
> /mnt/sdb/qemu/hw/scsi/scsi-disk.c:2399
>   #4 0x559753671201 (emu-system-x86_64+0x35c3201)  
> /mnt/sdb/qemu/hw/scsi/scsi-disk.c:2681
>   #5 0x559753687e3e (qemu-system-x86_64+0x35d9e3e)  
> /mnt/sdb/qemu/hw/scsi/scsi-bus.c:58
>   #6 0x55975368ac44 (qemu-system-x86_64+0x35dcc44)  
> /mnt/sdb/qemu/hw/scsi/scsi-bus.c:216
>   #7 0x5597532a7840 (qemu-system-x86_64+0x31f9840)  
> /mnt/sdb/qemu/hw/core/qdev.c:876
> 
> Direct leak of 15 byte(s) in 3 object(s) allocated from:
>   #0 0x7f19f8bed768 (/lib64/libasan.so.5+0xef768)  ??:?
>   #1 0x7f19f64d9445 (/lib64/libglib-2.0.so.0+0x52445)  ??:?
>   #2 0x7f19f64f2d92 (/lib64/libglib-2.0.so.0+0x6bd92)  ??:?
>   #3 0x55975366e06f (qemu-system-x86_64+0x35c006f)  
> /mnt/sdb/qemu/hw/scsi/scsi-disk.c:2388
>   #4 0x559753671201 (qemu-system-x86_64+0x35c3201)  
> /mnt/sdb/qemu/hw/scsi/scsi-disk.c:2681
>   #5 0x559753687e3e (qemu-system-x86_64+0x35d9e3e)  
> /mnt/sdb/qemu/hw/scsi/scsi-bus.c:58
>   #6 0x55975368ac44 (qemu-system-x86_64+0x35dcc44)  
> /mnt/sdb/qemu/hw/scsi/scsi-bus.c:216
> 
> @@ -3079,9 +3080,8 @@ static const TypeInfo scsi_cd_info = {
>  
>  #ifdef __linux__
>  static Property scsi_block_properties[] = {
> -    DEFINE_BLOCK_ERROR_PROPERTIES(SCSIDiskState, qdev.conf),         \
> +    DEFINE_SCSI_DISK_PROPERTIES(),.
The properties defined there shouldn't apply to scsi-block.

Can you explain what exactly is being leaked?

Paolo