linux-kernel - [syzbot] KASAN: vmalloc-out-of-bounds Read in blocking_notifier_chain

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Date:   Tue, 16 Aug 2022 02:06:28 -0700
From:   syzbot <syzbot+2fd9312f3ff65d22d06f@...kaller.appspotmail.com>
To:     bigeasy@...utronix.de, bp@...e.de, dmitry.osipenko@...labora.com,
        linux-kernel@...r.kernel.org, mirq-linux@...e.qmqm.pl,
        rafael.j.wysocki@...el.com, syzkaller-bugs@...glegroups.com,
        vschneid@...hat.com
Subject: [syzbot] KASAN: vmalloc-out-of-bounds Read in blocking_notifier_chain_unregister

Hello,

syzbot found the following issue on:

HEAD commit:    7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=160d0915080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=924833c12349a8c0
dashboard link: https://syzkaller.appspot.com/bug?extid=2fd9312f3ff65d22d06f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11f5b2f3080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=121c0067080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2fd9312f3ff65d22d06f@...kaller.appspotmail.com

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in notifier_chain_unregister kernel/notifier.c:51 [inline]
BUG: KASAN: vmalloc-out-of-bounds in blocking_notifier_chain_unregister+0x230/0x290 kernel/notifier.c:329
Read of size 8 at addr ffffc900038ebbe8 by task syz-executor342/3606

CPU: 1 PID: 3606 Comm: syz-executor342 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x59/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 notifier_chain_unregister kernel/notifier.c:51 [inline]
 blocking_notifier_chain_unregister+0x230/0x290 kernel/notifier.c:329
 hci_unregister_suspend_notifier+0x73/0x90 net/bluetooth/hci_core.c:2760
 hci_unregister_dev+0x16f/0x4e0 net/bluetooth/hci_core.c:2678
 vhci_release+0x7c/0xf0 drivers/bluetooth/hci_vhci.c:568
 __fput+0x277/0x9d0 fs/file_table.c:320
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xad5/0x29b0 kernel/exit.c:795
 do_group_exit+0xd2/0x2f0 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f278bd0d3c9
Code: Unable to access opcode bytes at RIP 0x7f278bd0d39f.
RSP: 002b:00007ffe2fd53298 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f278bd91450 RCX: 00007f278bd0d3c9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f278bd91450
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>

Memory state around the buggy address:
 ffffc900038eba80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900038ebb00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc900038ebb80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                                                          ^
 ffffc900038ebc00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900038ebc80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

---
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