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

pannengyuan@huawei.com posted 1 patch 1 week ago
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git fetch https://github.com/patchew-project/qemu tags/patchew/20200114091634.60856-1-pannengyuan@huawei.com
Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <fam@euphon.net>
hw/scsi/scsi-disk.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

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

Posted by pannengyuan@huawei.com 1 week ago
From: Pan Nengyuan <pannengyuan@huawei.com>

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

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
---
Changes V2 to V1:
- move 'drive' to the front to keep the original props's order.
---
 hw/scsi/scsi-disk.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index e44c61eeb4..a1194b9fa7 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -2981,7 +2981,6 @@ static const TypeInfo scsi_disk_base_info = {
 };
 
 #define DEFINE_SCSI_DISK_PROPERTIES()                                   \
-    DEFINE_PROP_DRIVE_IOTHREAD("drive", SCSIDiskState, qdev.conf.blk),  \
     DEFINE_BLOCK_PROPERTIES_BASE(SCSIDiskState, qdev.conf),             \
     DEFINE_BLOCK_ERROR_PROPERTIES(SCSIDiskState, qdev.conf),            \
     DEFINE_PROP_STRING("ver", SCSIDiskState, version),                  \
@@ -2992,6 +2991,7 @@ static const TypeInfo scsi_disk_base_info = {
 
 
 static Property scsi_hd_properties[] = {
+    DEFINE_PROP_DRIVE_IOTHREAD("drive", SCSIDiskState, qdev.conf.blk),
     DEFINE_SCSI_DISK_PROPERTIES(),
     DEFINE_PROP_BIT("removable", SCSIDiskState, features,
                     SCSI_DISK_F_REMOVABLE, false),
@@ -3047,6 +3047,7 @@ static const TypeInfo scsi_hd_info = {
 };
 
 static Property scsi_cd_properties[] = {
+    DEFINE_PROP_DRIVE_IOTHREAD("drive", SCSIDiskState, qdev.conf.blk),
     DEFINE_SCSI_DISK_PROPERTIES(),
     DEFINE_PROP_UINT64("wwn", SCSIDiskState, qdev.wwn, 0),
     DEFINE_PROP_UINT64("port_wwn", SCSIDiskState, qdev.port_wwn, 0),
@@ -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(),
     DEFINE_PROP_DRIVE("drive", SCSIDiskState, qdev.conf.blk),
-    DEFINE_PROP_BOOL("share-rw", SCSIDiskState, qdev.conf.share_rw, false),
     DEFINE_PROP_UINT16("rotation_rate", SCSIDiskState, rotation_rate, 0),
     DEFINE_PROP_UINT64("max_unmap_size", SCSIDiskState, max_unmap_size,
                        DEFAULT_MAX_UNMAP_SIZE),
@@ -3099,6 +3099,7 @@ static void scsi_block_class_initfn(ObjectClass *klass, void *data)
     SCSIDiskClass *sdc = SCSI_DISK_BASE_CLASS(klass);
 
     sc->realize      = scsi_block_realize;
+    sc->unrealize    = scsi_unrealize;
     sc->alloc_req    = scsi_block_new_request;
     sc->parse_cdb    = scsi_block_parse_cdb;
     sdc->dma_readv   = scsi_block_dma_readv;
@@ -3118,6 +3119,7 @@ static const TypeInfo scsi_block_info = {
 #endif
 
 static Property scsi_disk_properties[] = {
+    DEFINE_PROP_DRIVE_IOTHREAD("drive", SCSIDiskState, qdev.conf.blk),
     DEFINE_SCSI_DISK_PROPERTIES(),
     DEFINE_PROP_BIT("removable", SCSIDiskState, features,
                     SCSI_DISK_F_REMOVABLE, false),
-- 
2.21.0.windows.1



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

Posted by Paolo Bonzini 4 days ago
On 14/01/20 10:16, pannengyuan@huawei.com wrote:
> From: Pan Nengyuan <pannengyuan@huawei.com>
> 
> 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