syzbot

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BUG: KMSAN: uninit-value in sctp_inq_pop+0x15cb/0x1970 net/sctp/inqueue.c:205
CPU: 0 PID: 28466 Comm: syz-executor.4 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 sctp_inq_pop+0x15cb/0x1970 net/sctp/inqueue.c:205
 sctp_assoc_bh_rcv+0x207/0xe10 net/sctp/associola.c:994
 sctp_inq_push+0x31c/0x440 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x2bb/0x1710 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:1016 [inline]
 __release_sock+0x26b/0x670 net/core/sock.c:2556
 release_sock+0x98/0x2d0 net/core/sock.c:3080
 sctp_sendmsg+0x3c9c/0x5c60 net/sctp/socket.c:2018
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x9ea/0xc60 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto+0x107/0x130 net/socket.c:1985
 __ia32_sys_sendto+0x6e/0x90 net/socket.c:1985
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fef549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55e95fc EFLAGS: 00000296 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000203cef9f
RDX: 000000000000fffa RSI: 0000000000000000 RDI: 0000000020618000
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288
 __msan_chain_origin+0x54/0xa0 mm/kmsan/kmsan_instr.c:147
 sctp_inq_pop+0x155b/0x1970 net/sctp/inqueue.c:201
 sctp_assoc_bh_rcv+0x207/0xe10 net/sctp/associola.c:994
 sctp_inq_push+0x31c/0x440 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x2bb/0x1710 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:1016 [inline]
 __release_sock+0x26b/0x670 net/core/sock.c:2556
 release_sock+0x98/0x2d0 net/core/sock.c:3080
 sctp_sendmsg+0x3c9c/0x5c60 net/sctp/socket.c:2018
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x9ea/0xc60 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto+0x107/0x130 net/socket.c:1985
 __ia32_sys_sendto+0x6e/0x90 net/socket.c:1985
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:103
 kmsan_slab_alloc+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609
 kmalloc_reserve net/core/skbuff.c:353 [inline]
 __alloc_skb+0x4dd/0xe90 net/core/skbuff.c:424
 alloc_skb include/linux/skbuff.h:1103 [inline]
 sctp_packet_pack net/sctp/output.c:442 [inline]
 sctp_packet_transmit+0x17ac/0x44c0 net/sctp/output.c:588
 sctp_packet_transmit_chunk+0x17e/0x280 net/sctp/output.c:192
 sctp_outq_flush_data net/sctp/outqueue.c:1092 [inline]
 sctp_outq_flush+0x261c/0x6510 net/sctp/outqueue.c:1198
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1770 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline]
 sctp_do_sm+0x2d14/0xa160 net/sctp/sm_sideeffect.c:1156
 sctp_assoc_bh_rcv+0xa3f/0xe10 net/sctp/associola.c:1048
 sctp_inq_push+0x31c/0x440 net/sctp/inqueue.c:80
 sctp_backlog_rcv+0x2bb/0x1710 net/sctp/input.c:344
 sk_backlog_rcv include/net/sock.h:1016 [inline]
 __release_sock+0x26b/0x670 net/core/sock.c:2556
 release_sock+0x98/0x2d0 net/core/sock.c:3080
 sctp_sendmsg+0x3c9c/0x5c60 net/sctp/socket.c:2018
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x9ea/0xc60 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto+0x107/0x130 net/socket.c:1985
 __ia32_sys_sendto+0x6e/0x90 net/socket.c:1985
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
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