syzbot

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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: 0 PID: 23455 Comm: syz-executor.3 Not tainted 5.4.0-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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x64/0xc0 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:1049 [inline]
 _sctp_make_chunk+0xee/0x8c0 net/sctp/sm_make_chunk.c:1394
 sctp_make_control net/sctp/sm_make_chunk.c:1441 [inline]
 sctp_make_heartbeat+0xb8/0x9e0 net/sctp/sm_make_chunk.c:1148
 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline]
 sctp_sf_do_prm_requestheartbeat+0x8f/0x4b0 net/sctp/sm_statefuns.c:5329
 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152
 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185
 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2433
 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2686 [inline]
 sctp_setsockopt+0x189bb/0x19090 net/sctp/socket.c:4672
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3151
 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097
 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097
 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45a639
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:00007f06fbcc4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a639
RDX: 0000000000000009 RSI: 0000000000000084 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000098 R09: 0000000000000000
R10: 0000000020000280 R11: 0000000000000246 R12: 00007f06fbcc56d4
R13: 00000000004d1a88 R14: 00000000004e08f0 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:149 [inline]
 kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:317
 __msan_chain_origin+0x5c/0xc0 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:1049 [inline]
 sctp_packet_transmit+0x417/0x4250 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_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:185
 sctp_apply_peer_addr_params+0x212/0x1d40 net/sctp/socket.c:2433
 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2686 [inline]
 sctp_setsockopt+0x189bb/0x19090 net/sctp/socket.c:4672
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3151
 __sys_setsockopt+0x7c3/0xa30 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt+0xdd/0x100 net/socket.c:2097
 __x64_sys_setsockopt+0x62/0x80 net/socket.c:2097
 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:149 [inline]
 kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:132
 kmsan_slab_free+0x7a/0xe0 mm/kmsan/kmsan_hooks.c:107
 slab_free_freelist_hook mm/slub.c:1473 [inline]
 slab_free mm/slub.c:3046 [inline]
 kmem_cache_free_bulk+0x3bcb/0x3f40 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:353
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