Re: [PATCH] scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()

[kernel test robot <lkp@intel.com>]

Hi Li,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on jejb-scsi/for-next linus/master v5.19 next-20220728]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Li-Jinlin/scsi-iscsi-iscsi_tcp-Fix-null-ptr-deref-while-calling-getpeername/20220802-173945
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220803/202208032214.0FELL5gK-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ccc367df3fdba07b24eeda721ca928cce50f40d2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Li-Jinlin/scsi-iscsi-iscsi_tcp-Fix-null-ptr-deref-while-calling-getpeername/20220802-173945
        git checkout ccc367df3fdba07b24eeda721ca928cce50f40d2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/scsi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/scsi/iscsi_tcp.c: In function 'iscsi_sw_tcp_conn_get_param':
>> drivers/scsi/iscsi_tcp.c:798:26: warning: passing argument 1 of 'fget' makes integer from pointer without a cast [-Wint-conversion]
     798 |                 fget(sock->file);
         |                      ~~~~^~~~~~
         |                          |
         |                          struct file *
   In file included from drivers/scsi/iscsi_tcp.c:25:
   include/linux/file.h:48:39: note: expected 'unsigned int' but argument is of type 'struct file *'
      48 | extern struct file *fget(unsigned int fd);
         |                          ~~~~~~~~~~~~~^~
   drivers/scsi/iscsi_tcp.c: In function 'iscsi_sw_tcp_host_get_param':
   drivers/scsi/iscsi_tcp.c:852:26: warning: passing argument 1 of 'fget' makes integer from pointer without a cast [-Wint-conversion]
     852 |                 fget(sock->file);
         |                      ~~~~^~~~~~
         |                          |
         |                          struct file *
   In file included from drivers/scsi/iscsi_tcp.c:25:
   include/linux/file.h:48:39: note: expected 'unsigned int' but argument is of type 'struct file *'
      48 | extern struct file *fget(unsigned int fd);
         |                          ~~~~~~~~~~~~~^~


vim +/fget +798 drivers/scsi/iscsi_tcp.c

   777	
   778	static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
   779					       enum iscsi_param param, char *buf)
   780	{
   781		struct iscsi_conn *conn = cls_conn->dd_data;
   782		struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
   783		struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
   784		struct sockaddr_in6 addr;
   785		struct socket *sock;
   786		int rc;
   787	
   788		switch(param) {
   789		case ISCSI_PARAM_CONN_PORT:
   790		case ISCSI_PARAM_CONN_ADDRESS:
   791		case ISCSI_PARAM_LOCAL_PORT:
   792			spin_lock_bh(&conn->session->frwd_lock);
   793			if (!tcp_sw_conn || !tcp_sw_conn->sock) {
   794				spin_unlock_bh(&conn->session->frwd_lock);
   795				return -ENOTCONN;
   796			}
   797			sock = tcp_sw_conn->sock;
 > 798			fget(sock->file);
   799			spin_unlock_bh(&conn->session->frwd_lock);
   800	
   801			if (param == ISCSI_PARAM_LOCAL_PORT)
   802				rc = kernel_getsockname(sock,
   803							(struct sockaddr *)&addr);
   804			else
   805				rc = kernel_getpeername(sock,
   806							(struct sockaddr *)&addr);
   807			spin_lock_bh(&conn->session->frwd_lock);
   808			sockfd_put(sock);
   809			spin_unlock_bh(&conn->session->frwd_lock);
   810			if (rc < 0)
   811				return rc;
   812	
   813			return iscsi_conn_get_addr_param((struct sockaddr_storage *)
   814							 &addr, param, buf);
   815		default:
   816			return iscsi_conn_get_param(cls_conn, param, buf);
   817		}
   818	
   819		return 0;
   820	}
   821	

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