CVE-2022-48855: In the Linux kernel, the following vulnerability has been resolved:  sctp: fix kernel-infoleak for SCTP sockets  syzbot reported a kernel infoleak [1] of 4 bytes.  After analysis, it turned out r->idiag_expires is not initialized if inet_sctp_diag_fill() calls inet_diag_msg_common_fill()  Make sure to clear idiag_timer/idiag_retrans/idiag_expires and let inet_diag_msg_sctpasoc_fill() fill them again if needed.  [1]  BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:154 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668  instrument_copy_to_user include/linux/instrumented.h:121 [inline]  copyout lib/iov_iter.c:154 [inline]  _copy_to_iter+0x6ef/0x25a0 lib/iov_iter.c:668  copy_to_iter include/linux/uio.h:162 [inline]  simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519  __skb_datagram_iter+0x2d5/0x11b0 net/core/datagram.c:425  skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533  skb_copy_datagram_msg include/linux/skbuff.h:3696 [inline]  netlink_recvmsg+0x669/0x1c80 net/netlink/af_netlink.c:1977  sock_recvmsg_nosec net/socket.c:948 [inline]  sock_recvmsg net/socket.c:966 [inline]  __sys_recvfrom+0x795/0xa10 net/socket.c:2097  __do_sys_recvfrom net/socket.c:2115 [inline]  __se_sys_recvfrom net/socket.c:2111 [inline]  __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2111  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82  entry_SYSCALL_64_after_hwframe+0x44/0xae  Uninit was created at:  slab_post_alloc_hook mm/slab.h:737 [inline]  slab_alloc_node mm/slub.c:3247 [inline]  __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4975  kmalloc_reserve net/core/skbuff.c:354 [inline]  __alloc_skb+0x545/0xf90 net/core/skbuff.c:426  alloc_skb include/linux/skbuff.h:1158 [inline]  netlink_dump+0x3e5/0x16c0 net/netlink/af_netlink.c:2248  __netlink_dump_start+0xcf8/0xe90 net/netlink/af_netlink.c:2373  netlink_dump_start include/linux/netlink.h:254 [inline]  inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1341  sock_diag_rcv_msg+0x24a/0x620  netlink_rcv_skb+0x40c/0x7e0 net/netlink/af_netlink.c:2494  sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:277  netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]  netlink_unicast+0x1093/0x1360 net/netlink/af_netlink.c:1343  netlink_sendmsg+0x14d9/0x1720 net/netlink/af_netlink.c:1919  sock_sendmsg_nosec net/socket.c:705 [inline]  sock_sendmsg net/socket.c:725 [inline]  sock_write_iter+0x594/0x690 net/socket.c:1061  do_iter_readv_writev+0xa7f/0xc70  do_iter_write+0x52c/0x1500 fs/read_write.c:851  vfs_writev fs/read_write.c:924 [inline]  do_writev+0x645/0xe00 fs/read_write.c:967  __do_sys_writev fs/read_write.c:1040 [inline]  __se_sys_writev fs/read_write.c:1037 [inline]  __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037  do_syscall_x64 arch/x86/entry/common.c:51 [inline]  do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82  entry_SYSCALL_64_after_hwframe+0x44/0xae  Bytes 68-71 of 2508 are uninitialized Memory access of size 2508 starts at ffff888114f9b000 Data copied to user address 00007f7fe09ff2e0  CPU: 1 PID: 3478 Comm: syz-executor306 Not tainted 5.17.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011