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    SubjectKASAN: stack-out-of-bounds Read in i801_isr
    From
    Hello,

    syzbot found the following crash on:

    HEAD commit: 452424cd Merge branch 'parisc-5.5-3' of git://git.kernel.o..
    git tree: upstream
    console output: https://syzkaller.appspot.com/x/log.txt?x=17f7ac21e00000
    kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4
    dashboard link: https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e
    compiler: gcc (GCC) 9.0.0 20181231 (experimental)
    userspace arch: i386

    Unfortunately, I don't have any reproducer for this crash yet.

    IMPORTANT: if you fix the bug, please add the following tag to the commit:
    Reported-by: syzbot+8c8dedc0ba9e03f6c79e@syzkaller.appspotmail.com

    ==================================================================
    BUG: KASAN: stack-out-of-bounds in i801_isr_byte_done
    drivers/i2c/busses/i2c-i801.c:603 [inline]
    BUG: KASAN: stack-out-of-bounds in i801_isr
    drivers/i2c/busses/i2c-i801.c:663 [inline]
    BUG: KASAN: stack-out-of-bounds in i801_isr+0xcb7/0xcf0
    drivers/i2c/busses/i2c-i801.c:644
    Read of size 1 at addr ffffc9000beb7d38 by task syz-executor.3/2994

    CPU: 1 PID: 2994 Comm: syz-executor.3 Not tainted 5.5.0-rc6-syzkaller #0
    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
    rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
    Call Trace:
    <IRQ>
    __dump_stack lib/dump_stack.c:77 [inline]
    dump_stack+0x197/0x210 lib/dump_stack.c:118
    print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374
    __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
    kasan_report+0x12/0x20 mm/kasan/common.c:639
    __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132
    i801_isr_byte_done drivers/i2c/busses/i2c-i801.c:603 [inline]
    i801_isr drivers/i2c/busses/i2c-i801.c:663 [inline]
    i801_isr+0xcb7/0xcf0 drivers/i2c/busses/i2c-i801.c:644
    __handle_irq_event_percpu+0x15d/0x970 kernel/irq/handle.c:149
    handle_irq_event_percpu+0x74/0x160 kernel/irq/handle.c:189
    handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206
    handle_fasteoi_irq+0x281/0x670 kernel/irq/chip.c:725
    generic_handle_irq_desc include/linux/irqdesc.h:156 [inline]
    do_IRQ+0xde/0x280 arch/x86/kernel/irq.c:250
    common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:607
    RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
    RIP: 0010:__do_softirq+0x227/0x98c kernel/softirq.c:280
    Code: c7 c0 e8 34 93 89 48 c1 e8 03 42 80 3c 30 00 0f 85 b1 06 00 00 48 83
    3d ce 32 93 01 00 0f 84 d6 05 00 00 fb 66 0f 1f 44 00 00 <b8> ff ff ff ff
    48 c7 45 c8 00 91 80 89 0f bc 45 d4 83 c0 01 89 45
    RSP: 0018:ffffc900004e8f18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffdd
    RAX: 1ffffffff132669d RBX: ffff88801eccdf00 RCX: 0000000000000002
    RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801ecce794
    RBP: ffffc900004e8f98 R08: 1ffffffff165e7a6 R09: fffffbfff165e7a7
    R10: fffffbfff165e7a6 R11: ffffffff8b2f3d37 R12: 0000000000000000
    R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
    invoke_softirq kernel/softirq.c:373 [inline]
    irq_exit+0x19b/0x1e0 kernel/softirq.c:413
    exiting_irq arch/x86/include/asm/apic.h:536 [inline]
    smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
    apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
    </IRQ>
    RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752
    [inline]
    RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160
    [inline]
    RIP: 0010:_raw_spin_unlock_irqrestore+0x90/0xe0
    kernel/locking/spinlock.c:191
    Code: 48 c7 c0 d8 34 93 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c
    10 00 75 39 48 83 3d 7f e0 be 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00
    bf 01 00 00 00 e8 11 36 7c f9 65 8b 05 12 ca 2d 78
    RSP: 0018:ffffc9000c6e7b90 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
    RAX: 1ffffffff132669b RBX: 0000000000000282 RCX: 0000000000000006
    RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
    RBP: ffffc9000c6e7ba0 R08: 1ffffffff165e7a6 R09: fffffbfff165e7a7
    R10: fffffbfff165e7a6 R11: ffffffff8b2f3d37 R12: ffff88802a79d158
    R13: ffff88802a79d150 R14: 0000000000000282 R15: ffff88802a79d158
    kthread_queue_work+0xa4/0x160 kernel/kthread.c:829
    kthread_flush_worker+0xca/0x110 kernel/kthread.c:1165
    loop_unprepare_queue drivers/block/loop.c:894 [inline]
    __loop_clr_fd+0x5d9/0xd80 drivers/block/loop.c:1157
    loop_clr_fd drivers/block/loop.c:1237 [inline]
    lo_ioctl+0x2bd/0x1460 drivers/block/loop.c:1606
    lo_compat_ioctl+0xb6/0x110 drivers/block/loop.c:1782
    compat_blkdev_ioctl+0x274/0x1c30 block/compat_ioctl.c:422
    __do_compat_sys_ioctl fs/compat_ioctl.c:214 [inline]
    __se_compat_sys_ioctl fs/compat_ioctl.c:142 [inline]
    __ia32_compat_sys_ioctl+0x233/0x610 fs/compat_ioctl.c:142
    do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
    do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
    entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
    RIP: 0023:0xf7fe2a39
    Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c
    24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90
    90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
    RSP: 002b:00000000f5dddf08 EFLAGS: 00000292 ORIG_RAX: 0000000000000036
    RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000004c01
    RDX: 0000000000000000 RSI: 000000000812d000 RDI: 0000000000000000
    RBP: 00000000f5dde158 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
    R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000


    Memory state around the buggy address:
    ffffc9000beb7c00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
    ffffc9000beb7c80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
    > ffffc9000beb7d00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
    ^
    ffffc9000beb7d80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
    ffffc9000beb7e00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
    ==================================================================


    ---
    This bug is generated by a bot. It may contain errors.
    See https://goo.gl/tpsmEJ for more information about syzbot.
    syzbot engineers can be reached at syzkaller@googlegroups.com.

    syzbot will keep track of this bug report. See:
    https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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