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SubjectKASAN: vmalloc-out-of-bounds Write in i801_isr

syzbot found the following crash on:

HEAD commit: 040a3c33 Merge tag 'iommu-fixes-v5.5-rc5' of git://git.ker..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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:

BUG: KASAN: vmalloc-out-of-bounds in i801_isr_byte_done
drivers/i2c/busses/i2c-i801.c:592 [inline]
BUG: KASAN: vmalloc-out-of-bounds in i801_isr
drivers/i2c/busses/i2c-i801.c:663 [inline]
BUG: KASAN: vmalloc-out-of-bounds in i801_isr+0xbfd/0xcf0
Write of size 1 at addr ffffc90002c07bc9 by task syz-executor.3/9465

CPU: 3 PID: 9465 Comm: syz-executor.3 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 04/01/2014
Call Trace:
__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_store1_noabort+0x17/0x20 mm/kasan/generic_report.c:137
i801_isr_byte_done drivers/i2c/busses/i2c-i801.c:592 [inline]
i801_isr drivers/i2c/busses/i2c-i801.c:663 [inline]
i801_isr+0xbfd/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:__sanitizer_cov_trace_const_cmp4+0xd/0x20 kernel/kcov.c:274
Code: d6 0f b7 f7 bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3
66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 <48> 8b 4d 08 e8
ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89
RSP: 0018:ffffc90001d4f860 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdc
RAX: ffff88805df60100 RBX: 000000000000000c RCX: 000000000000000c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90001d4f860 R08: ffff88805df60100 R09: fffff520003a9f23
R10: fffff520003a9f22 R11: 0000000000000000 R12: ffff88802057db00
R13: 0000000000000030 R14: 00000000000002e6 R15: 0000000000000000
tomoyo_domain_quota_is_ok+0x312/0x540 security/tomoyo/util.c:1071
tomoyo_supervisor+0x2e8/0xef0 security/tomoyo/common.c:2089
tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
tomoyo_path_permission security/tomoyo/file.c:587 [inline]
tomoyo_path_permission+0x263/0x360 security/tomoyo/file.c:573
tomoyo_path_perm+0x318/0x430 security/tomoyo/file.c:838
tomoyo_path_unlink+0x9b/0xe0 security/tomoyo/tomoyo.c:156
security_path_unlink+0xfa/0x160 security/security.c:1044
do_unlinkat+0x3b7/0x6d0 fs/namei.c:4064
__do_sys_unlink fs/namei.c:4114 [inline]
__se_sys_unlink fs/namei.c:4112 [inline]
__x64_sys_unlink+0x42/0x50 fs/namei.c:4112
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
RIP: 0033:0x45ad27
Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 5d b4 fb ff c3
66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 0f 83 3d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffebdeee5d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007ffebdeee6a0 RCX: 000000000045ad27
RDX: 00007ffebdeee610 RSI: 00007ffebdeee610 RDI: 00007ffebdeee6a0
RBP: 0000000000000000 R08: 000000000137b983 R09: 0000000000000011
R10: ffffffffffffffff R11: 0000000000000206 R12: 00007ffebdeef730
R13: 000000000137b940 R14: 0000000000390ffe R15: 00000000ffffffff

Memory state around the buggy address:
ffffc90002c07a80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
ffffc90002c07b00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
> ffffc90002c07b80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
ffffc90002c07c00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
ffffc90002c07c80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9

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