================================================================== BUG: KMSAN: uninit-value in netlink_rcv_skb+0x3e3/0x600 net/netlink/af_netlink.c:2437 CPU: 0 PID: 7189 Comm: syz-executor3 Not tainted 4.17.0-rc5+ #102 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686 netlink_rcv_skb+0x3e3/0x600 net/netlink/af_netlink.c:2437 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4664 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x1678/0x1750 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x104f/0x1350 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] kernel_sendmsg+0x228/0x2d0 net/socket.c:647 sock_no_sendpage+0x1c8/0x250 net/core/sock.c:2642 kernel_sendpage net/socket.c:3323 [inline] sock_sendpage+0x1de/0x2c0 net/socket.c:854 pipe_to_sendpage+0x31b/0x430 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x49a/0xf30 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1c6/0x2a0 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19b/0x200 fs/splice.c:1018 splice_direct_to_actor+0x764/0x1040 fs/splice.c:973 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a09 RSP: 002b:00007f3459cb6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f3459cb76d4 RCX: 0000000000455a09 RDX: 00000000200000c0 RSI: 0000000000000015 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000080000002 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000579 R14: 00000000006fc3f8 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_save_stack mm/kmsan/kmsan.c:294 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:527 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:478 _copy_from_iter_full+0xe06/0x1440 lib/iov_iter.c:614 copy_from_iter_full include/linux/uio.h:124 [inline] memcpy_from_msg include/linux/skbuff.h:3313 [inline] netlink_sendmsg+0xdf9/0x1350 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] kernel_sendmsg+0x228/0x2d0 net/socket.c:647 sock_no_sendpage+0x1c8/0x250 net/core/sock.c:2642 kernel_sendpage net/socket.c:3323 [inline] sock_sendpage+0x1de/0x2c0 net/socket.c:854 pipe_to_sendpage+0x31b/0x430 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x49a/0xf30 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0x1c6/0x2a0 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x19b/0x200 fs/splice.c:1018 splice_direct_to_actor+0x764/0x1040 fs/splice.c:973 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:815 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:885 __alloc_pages_nodemask+0xfc0/0x5dc0 mm/page_alloc.c:4402 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:494 [inline] push_pipe+0x680/0xca0 lib/iov_iter.c:521 __pipe_get_pages lib/iov_iter.c:1028 [inline] pipe_get_pages lib/iov_iter.c:1062 [inline] iov_iter_get_pages+0x1357/0x1810 lib/iov_iter.c:1073 dio_refill_pages fs/direct-io.c:170 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:980 [inline] do_blockdev_direct_IO fs/direct-io.c:1331 [inline] __blockdev_direct_IO+0x1a82/0x65c0 fs/direct-io.c:1417 ext4_direct_IO_read fs/ext4/inode.c:3833 [inline] ext4_direct_IO+0xecd/0x27f0 fs/ext4/inode.c:3865 generic_file_read_iter+0x3c75/0x44e0 mm/filemap.c:2341 ext4_file_read_iter+0x30f/0x520 include/linux/fs.h:728 call_read_iter include/linux/fs.h:1778 [inline] generic_file_splice_read+0x5d2/0x900 fs/splice.c:307 do_splice_to fs/splice.c:880 [inline] splice_direct_to_actor+0x4c6/0x1040 fs/splice.c:952 do_splice_direct+0x335/0x540 fs/splice.c:1061 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ==================================================================