libsmtp--库的一个bug
http://libsmtp.sourceforge.net/用纯C写的smtp客户端已经很少了，更重要的是性能要好，不要有太多附加的东西，只需要完成smtp主要协议就行，
我还是很喜欢这个项目的，我用它做smtp邮件系统的性能测试，可惜好久没更新了。
file:plg_login.c
/* username */ usr = (char*)malloc_ (2*strlen (srv->username)+4); siz = alg_b64_encode (srv->username, strlen (srv->username), usr); if (smtp_write (srv, usr, siz) == -1) { free_ (usr, NULL); return (-1); /* error msg is already set */ } if ((rsp = smtp_read_response_ (srv, 1)) == NULL) { free_ (usr, NULL); return (-1); /* error msg is already set */ } free_ (rsp, usr, NULL); /* password */ pwd = (char*)malloc_ (2*strlen (srv->password)+4); siz = alg_b64_encode (srv->password, strlen (srv->password), pwd); if (smtp_write (srv, pwd, siz) == -1) { free_ (pwd, NULL); return (-1); /* error msg is already set */ } if ((rsp = smtp_read_response_ (srv, 1)) == NULL) { free_ (pwd, NULL); return (-1); /* error msg is already set */ }// free_ (rsp, usr, NULL);/*change usr to pwd.*/ free_ (rsp, pwd, NULL);
释放指针的时候对usr释放了两次，导致系统报错double free。
第二次usr释放应该改为释放pwd。
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