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BUG: KASAN: slab-out-of-bounds in suffix_kstrtoint.constprop.14+0x17e/0x1d0 fs/xfs/xfs_super.c:1114
Read of size 1 at addr ffff88809c4b437f by task syz-executor.0/8256

CPU: 1 PID: 8256 Comm: syz-executor.0 Not tainted 5.5.0-rc1-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+0x12d/0x187 lib/dump_stack.c:118
 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374
 __kasan_report.cold.11+0x1b/0x3a 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
 suffix_kstrtoint.constprop.14+0x17e/0x1d0 fs/xfs/xfs_super.c:1114
 xfs_fc_parse_param+0x82d/0xbe0 fs/xfs/xfs_super.c:1158
 vfs_parse_fs_param+0x245/0x490 fs/fs_context.c:145
 vfs_parse_fs_string+0xbc/0x110 fs/fs_context.c:189
 generic_parse_monolithic+0x11a/0x190 fs/fs_context.c:229
 parse_monolithic_mount_data+0x5c/0x90 fs/fs_context.c:705
 do_new_mount fs/namespace.c:2818 [inline]
 do_mount+0x122d/0x1b60 fs/namespace.c:3142
 ksys_mount+0xba/0xe0 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xb9/0x150 fs/namespace.c:3362
 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ddea
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f48fff2ba68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f48fff2c6d4 RCX: 000000000045ddea
RDX: 00007f48fff2bae0 RSI: 0000000020000080 RDI: 00007f48fff2bb00
RBP: 000000000075bf20 R08: 00007f48fff2bb40 R09: 00007f48fff2bae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000bb4 R14: 00000000004cc91e R15: 000000000075bf2c

Allocated by task 4723:
 save_stack+0x21/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc.constprop.17+0xc7/0xd0 mm/kasan/common.c:513
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 single_open+0x50/0x1d0 fs/seq_file.c:569
 proc_single_open+0x16/0x20 fs/proc/base.c:764
 do_dentry_open+0x3fa/0x1100 fs/open.c:797
 vfs_open+0x9a/0xc0 fs/open.c:914
 do_last fs/namei.c:3420 [inline]
 path_openat+0xb08/0x3bd0 fs/namei.c:3537
 do_filp_open+0x177/0x250 fs/namei.c:3567
 do_sys_open+0x1dd/0x370 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x79/0xb0 fs/open.c:1110
 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4723:
 save_stack+0x21/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3757
 single_release+0x8b/0xc0 fs/seq_file.c:609
 __fput+0x25a/0x770 fs/file_table.c:280
 ____fput+0x9/0x10 fs/file_table.c:313
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x4ff/0x5f0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809c4b4340
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 31 bytes to the right of
 32-byte region [ffff88809c4b4340, ffff88809c4b4360)
The buggy address belongs to the page:
page:ffffea0002712d00 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809c4b4fc1
raw: 00fffe0000000200 ffffea00027d9288 ffff8880aa401238 ffff8880aa4001c0
raw: ffff88809c4b4fc1 ffff88809c4b4000 000000010000002e 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809c4b4200: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
 ffff88809c4b4280: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
>ffff88809c4b4300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                                                                ^
 ffff88809c4b4380: 01 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809c4b4400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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