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Subjectio_uring/net.c:564:44: sparse: sparse: incorrect type in assignment (different address spaces)
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 31be1d0fbd950395701d9fd47d8fb1f99c996f61
commit: 9bb66906f23e50d6db1e11f7498b72dfca1982a2 io_uring: support multishot in recvmsg
date: 11 days ago
config: alpha-randconfig-s043-20220804 (https://download.01.org/0day-ci/archive/20220805/202208051104.7NeIlCzj-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bb66906f23e50d6db1e11f7498b72dfca1982a2
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9bb66906f23e50d6db1e11f7498b72dfca1982a2
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash

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

sparse warnings: (new ones prefixed by >>)
io_uring/net.c: note: in included file (through io_uring/io_uring.h):
io_uring/slist.h:138:29: sparse: sparse: no newline at end of file
>> io_uring/net.c:564:44: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void [noderef] __user *msg_control_user @@ got void * @@
io_uring/net.c:564:44: sparse: expected void [noderef] __user *msg_control_user
io_uring/net.c:564:44: sparse: got void *
>> io_uring/net.c:569:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected void [noderef] __user * @@ got void * @@
io_uring/net.c:569:14: sparse: expected void [noderef] __user *
io_uring/net.c:569:14: sparse: got void *

vim +564 io_uring/net.c

548
549 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
550 struct io_sr_msg *sr, void __user **buf,
551 size_t *len)
552 {
553 unsigned long ubuf = (unsigned long) *buf;
554 unsigned long hdr;
555
556 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
557 kmsg->controllen;
558 if (*len < hdr)
559 return -EFAULT;
560
561 if (kmsg->controllen) {
562 unsigned long control = ubuf + hdr - kmsg->controllen;
563
> 564 kmsg->msg.msg_control_user = (void *) control;
565 kmsg->msg.msg_controllen = kmsg->controllen;
566 }
567
568 sr->buf = *buf; /* stash for later copy */
> 569 *buf = (void *) (ubuf + hdr);
570 kmsg->payloadlen = *len = *len - hdr;
571 return 0;
572 }
573

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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