===================================================== BUG: KMSAN: use-after-free in slab_alloc_node mm/slub.c:2762 [inline] BUG: KMSAN: use-after-free in kmem_cache_alloc_node+0x5a9/0xe60 mm/slub.c:2836 CPU: 1 PID: 19138 Comm: syz-executor.1 Not tainted 5.4.0-rc5+ #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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 slab_alloc_node mm/slub.c:2762 [inline] kmem_cache_alloc_node+0x5a9/0xe60 mm/slub.c:2836 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 alloc_skb include/linux/skbuff.h:1050 [inline] _sctp_make_chunk+0xee/0x8c0 net/sctp/sm_make_chunk.c:1394 sctp_make_data net/sctp/sm_make_chunk.c:1426 [inline] sctp_make_datafrag_empty+0x228/0x710 net/sctp/sm_make_chunk.c:740 sctp_datamsg_from_user+0x1034/0x2060 net/sctp/chunk.c:264 sctp_sendmsg_to_asoc+0x1ed8/0x3080 net/sctp/socket.c:1845 sctp_sendmsg+0x30d6/0x5010 net/sctp/socket.c:2017 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] kernel_sendmsg+0x384/0x440 net/socket.c:677 sock_no_sendpage+0x205/0x2b0 net/core/sock.c:2742 kernel_sendpage net/socket.c:3684 [inline] sock_sendpage+0x272/0x2e0 net/socket.c:935 pipe_to_sendpage+0x342/0x470 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x484/0xe80 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:829 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1020 splice_direct_to_actor+0x852/0x1130 fs/splice.c:975 do_splice_direct+0x342/0x580 fs/splice.c:1063 do_sendfile+0x1010/0x1d20 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1511 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1511 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x45a669 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3c05df0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a669 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 000080001d00c0d0 R11: 0000000000000246 R12: 00007f3c05df16d4 R13: 00000000004c83ff R14: 00000000004de830 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 __msan_chain_origin+0x6b/0xd0 mm/kmsan/kmsan_instr.c:179 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2636 __slab_alloc mm/slub.c:2689 [inline] slab_alloc_node mm/slub.c:2763 [inline] kmem_cache_alloc_node+0xaf4/0xe60 mm/slub.c:2836 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 alloc_skb include/linux/skbuff.h:1050 [inline] sctp_packet_transmit+0x417/0x42f0 net/sctp/output.c:572 sctp_outq_flush_transports net/sctp/outqueue.c:1146 [inline] sctp_outq_flush+0x1823/0x5d80 net/sctp/outqueue.c:1194 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:757 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1781 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline] sctp_do_sm+0x8fe1/0x9720 net/sctp/sm_sideeffect.c:1155 sctp_primitive_SEND+0x175/0x1a0 net/sctp/primitive.c:163 sctp_sendmsg_to_asoc+0x2a44/0x3080 net/sctp/socket.c:1859 sctp_sendmsg+0x30d6/0x5010 net/sctp/socket.c:2017 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] kernel_sendmsg+0x384/0x440 net/socket.c:677 sock_no_sendpage+0x205/0x2b0 net/core/sock.c:2742 kernel_sendpage net/socket.c:3684 [inline] sock_sendpage+0x272/0x2e0 net/socket.c:935 pipe_to_sendpage+0x342/0x470 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x484/0xe80 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:829 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0x19e/0x200 fs/splice.c:1020 splice_direct_to_actor+0x852/0x1130 fs/splice.c:975 do_splice_direct+0x342/0x580 fs/splice.c:1063 do_sendfile+0x1010/0x1d20 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1511 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1511 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134 kmsan_slab_free+0x8d/0xf0 mm/kmsan/kmsan_hooks.c:108 slab_free_freelist_hook mm/slub.c:1473 [inline] slab_free mm/slub.c:3046 [inline] kmem_cache_free_bulk+0x3ad9/0x3f10 mm/slub.c:3171 __kfree_skb_flush+0xb0/0x100 net/core/skbuff.c:862 net_rx_action+0x1a5e/0x1aa0 net/core/dev.c:6483 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 =====================================================