[isilence:zc/veth 1010/1018] io_uring/net.c:1071:40: sparse: sparse: Using plain integer as NULL pointer

[isilence:zc/veth 1010/1018] io_uring/net.c:1071:40: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://github.com/isilence/linux zc/veth
head:   cff8a226d561bc0db814b65ca5d2c97894d4d1cd
commit: 8206eff884a896c949649e8a9160b085a6f8cc82 [1010/1018] io_uring: add io_recvzc request
config: i386-randconfig-061-20231026 (https://download.01.org/0day-ci/archive/20231027/202310270410.i2YHUIFm-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231027/202310270410.i2YHUIFm-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310270410.i2YHUIFm-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   io_uring/net.c: note: in included file (through io_uring/io_uring.h):
   include/linux/io_uring_types.h:308:48: sparse: sparse: array of flexible structures
>> io_uring/net.c:1071:40: sparse: sparse: Using plain integer as NULL pointer

vim +1071 io_uring/net.c

  1016	
  1017	int io_recvzc(struct io_kiocb *req, unsigned int issue_flags)
  1018	{
  1019		struct io_recvzc *zc = io_kiocb_to_cmd(req, struct io_recvzc);
  1020		struct socket *sock;
  1021		unsigned flags;
  1022		int ret, min_ret = 0;
  1023		bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
  1024	
  1025		if (!(req->flags & REQ_F_POLLED) &&
  1026		    (zc->flags & IORING_RECVSEND_POLL_FIRST))
  1027			return -EAGAIN;
  1028	
  1029		sock = sock_from_file(req->file);
  1030		if (unlikely(!sock))
  1031			return -ENOTSOCK;
  1032	
  1033	retry_multishot:
  1034		flags = zc->msg_flags;
  1035		if (force_nonblock)
  1036			flags |= MSG_DONTWAIT;
  1037		if (flags & MSG_WAITALL)
  1038			min_ret = zc->len;
  1039	
  1040		ret = io_zc_rx_recv(sock, zc->datalen, flags);
  1041		if (ret < min_ret) {
  1042			if (ret == -EAGAIN && force_nonblock) {
  1043				if (issue_flags & IO_URING_F_MULTISHOT) {
  1044					io_kbuf_recycle(req, issue_flags);
  1045					return IOU_ISSUE_SKIP_COMPLETE;
  1046				}
  1047	
  1048				return -EAGAIN;
  1049			}
  1050			if (ret > 0 && io_net_retry(sock, flags)) {
  1051				zc->len -= ret;
  1052				zc->buf += ret;
  1053				zc->done_io += ret;
  1054				req->flags |= REQ_F_PARTIAL_IO;
  1055				return -EAGAIN;
  1056			}
  1057			if (ret == -ERESTARTSYS)
  1058				ret = -EINTR;
  1059			req_set_fail(req);
  1060		} else if ((flags & MSG_WAITALL) && (flags & (MSG_TRUNC | MSG_CTRUNC))) {
  1061			req_set_fail(req);
  1062		}
  1063	
  1064		if (ret > 0)
  1065			ret += zc->done_io;
  1066		else if (zc->done_io)
  1067			ret = zc->done_io;
  1068		else
  1069			io_kbuf_recycle(req, issue_flags);
  1070	
> 1071		if (!io_recv_finish(req, &ret, 0, ret <= 0, issue_flags))
  1072			goto retry_multishot;
  1073	
  1074		return ret;
  1075	}
  1076	

-- 
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