• dann frazier's avatar
    ocfs2_connection_find() returns pointer to bad structure · 226291aa
    dann frazier authored
    If ocfs2_live_connection_list is empty, ocfs2_connection_find() will return
    a pointer to the LIST_HEAD, cast as a ocfs2_live_connection. This can cause
    an oops when ocfs2_control_send_down() dereferences c->oc_conn:
    
    Call Trace:
      [<ffffffffa00c2a3c>] ocfs2_control_message+0x28c/0x2b0 [ocfs2_stack_user]
      [<ffffffffa00c2a95>] ocfs2_control_write+0x35/0xb0 [ocfs2_stack_user]
      [<ffffffff81143a88>] vfs_write+0xb8/0x1a0
      [<ffffffff8155cc13>] ? do_page_fault+0x153/0x3b0
      [<ffffffff811442f1>] sys_write+0x51/0x80
      [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b
    
    Fix by explicitly returning NULL if no match is found.
    Signed-off-by: default avatardann frazier <dann.frazier@canonical.com>
    Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
    226291aa
stack_user.c 23.2 KB