===================================================== BUG: KMSAN: uninit-value in __nlmsg_parse include/net/netlink.h:713 [inline] BUG: KMSAN: uninit-value in nlmsg_parse_deprecated include/net/netlink.h:758 [inline] BUG: KMSAN: uninit-value in __tipc_nl_compat_dumpit+0x5cd/0x1450 net/tipc/netlink_compat.c:215 CPU: 0 PID: 10315 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 __nlmsg_parse include/net/netlink.h:713 [inline] nlmsg_parse_deprecated include/net/netlink.h:758 [inline] __tipc_nl_compat_dumpit+0x5cd/0x1450 net/tipc/netlink_compat.c:215 tipc_nl_compat_dumpit+0x7f9/0x9d0 net/tipc/netlink_compat.c:308 tipc_nl_compat_handle net/tipc/netlink_compat.c:1215 [inline] tipc_nl_compat_recv+0x119c/0x2bf0 net/tipc/netlink_compat.c:1311 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline] genl_family_rcv_msg net/netlink/genetlink.c:714 [inline] genl_rcv_msg+0x1703/0x18a0 net/netlink/genetlink.c:731 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469 genl_rcv+0x63/0x80 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __compat_sys_sendmsg net/compat.c:466 [inline] __do_compat_sys_sendmsg net/compat.c:473 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:470 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:470 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f54549 Code: Bad RIP value. RSP: 002b:00000000f554e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000200007c0 RDX: 0000000004000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2839 [inline] __kmalloc_node_track_caller+0xeab/0x12e0 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] nlmsg_new include/net/netlink.h:940 [inline] tipc_nl_compat_dumpit+0x77c/0x9d0 net/tipc/netlink_compat.c:301 tipc_nl_compat_handle net/tipc/netlink_compat.c:1215 [inline] tipc_nl_compat_recv+0x119c/0x2bf0 net/tipc/netlink_compat.c:1311 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline] genl_family_rcv_msg net/netlink/genetlink.c:714 [inline] genl_rcv_msg+0x1703/0x18a0 net/netlink/genetlink.c:731 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469 genl_rcv+0x63/0x80 net/netlink/genetlink.c:742 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __compat_sys_sendmsg net/compat.c:466 [inline] __do_compat_sys_sendmsg net/compat.c:473 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:470 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:470 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c =====================================================