• Sowmini Varadhan's avatar
    rds; Reset rs->rs_bound_addr in rds_add_bound() failure path · 7ae0c649
    Sowmini Varadhan authored
    If the rds_sock is not added to the bind_hash_table, we must
    reset rs_bound_addr so that rds_remove_bound will not trip on
    this rds_sock.
    
    rds_add_bound() does a rds_sock_put() in this failure path, so
    failing to reset rs_bound_addr will result in a socket refcount
    bug, and will trigger a WARN_ON with the stack shown below when
    the application subsequently tries to close the PF_RDS socket.
    
         WARNING: CPU: 20 PID: 19499 at net/rds/af_rds.c:496 \
    		rds_sock_destruct+0x15/0x30 [rds]
           :
         __sk_destruct+0x21/0x190
         rds_remove_bound.part.13+0xb6/0x140 [rds]
         rds_release+0x71/0x120 [rds]
         sock_release+0x1a/0x70
         sock_close+0xe/0x20
         __fput+0xd5/0x210
         task_work_run+0x82/0xa0
         do_exit+0x2ce/0xb30
         ? syscall_trace_enter+0x1cc/0x2b0
         do_group_exit+0x39/0xa0
         SyS_exit_group+0x10/0x10
         do_syscall_64+0x61/0x1a0
    Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
    Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@oracle.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    7ae0c649
bind.c 5.13 KB