[PATCH 0/4] fix crashes when inject errors to vhost-user-blk chardev

[Li Feng <fengli@smartx.com>]

The following patches fix various crashes happened when injecting errors to
chardev unix domain socket.

The crashes are encountered when the socket is from connected to disconnected at
vhost-user-blk realize routine.

These crashes could be reproduced like this:
1. gdb break at vhost_user_write;
2. add a vhost-user-blk device through qmp;
3. when stop at vhost_user_write, kill the vhost-user-blk target;
3. let qemu continue running;
4. start vhost-user-blk;
5. see crash!

The 'CLOSE' event path is core trouble maker.

qemu_chr_fe_set_handlers
   -> vhost_user_blk_event(OPEN)
       -> vhost_user_blk_connect
            -> vhost_dev_init
                -> vhost_user_blk_event(CLOSE)
                -> vhost_dev_cleanup


Li Feng (4):
  vhost-user-blk: delay vhost_user_blk_disconnect
  vhost-user-blk: fix invalid memory access
  char-socket: avoid double call tcp_chr_free_connection
  vhost-user-blk: fix crash in realize process

 chardev/char-socket.c     |  5 ++++
 hw/block/vhost-user-blk.c | 75 ++++++++++++++++++++++++++++++++---------------
 hw/virtio/vhost.c         |  2 +-
 3 files changed, 58 insertions(+), 24 deletions(-)

-- 
2.11.0


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