syz.5.628: attempt to access beyond end of device
loop5: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop5, logical block 3245768, async page read
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6261 at fs/inode.c:389 inc_nlink+0x128/0x154 fs/inode.c:389
Modules linked in:
CPU: 1 PID: 6261 Comm: syz.5.628 Tainted: G        W          6.1.121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : inc_nlink+0x128/0x154 fs/inode.c:389
lr : inc_nlink+0x128/0x154 fs/inode.c:389
sp : ffff8000219c7b70
x29: ffff8000219c7b70 x28: dfff800000000000 x27: 0000000000000000
x26: 1fffe00019898815 x25: ffff800012714688 x24: 0000000000000000
x23: 1fffe0001c5e2010 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e2f10038 x19: ffff0000e2f10080 x18: ffff8000219c73c0
x17: ffff800018b7b000 x16: ffff80001232b49c x15: 0000000000000002
x14: 00000000ffff8000 x13: 000000006b9f4420 x12: 0000000000080000
x11: 000000000000dd83 x10: ffff8000341ae000 x9 : ffff800008aaed64
x8 : 000000000000dd84 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0000df448eb0 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 inc_nlink+0x128/0x154 fs/inode.c:389
 inode_inc_link_count include/linux/fs.h:2576 [inline]
 sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
 do_mkdirat+0x220/0x510 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 2020
hardirqs last  enabled at (2019): [<ffff800008978a74>] kasan_quarantine_put+0xdc/0x204 mm/kasan/quarantine.c:242
hardirqs last disabled at (2020): [<ffff800012327fd4>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1990): [<ffff8000081c3418>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (1990): [<ffff8000081c3418>] handle_softirqs+0xb84/0xd58 kernel/softirq.c:599
softirqs last disabled at (1841): [<ffff800008020174>] __do_softirq+0x14/0x20 kernel/softirq.c:605
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xd8c/0xf04 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0000fa62c1ce by task syz.5.628/6261

CPU: 1 PID: 6261 Comm: syz.5.628 Tainted: G        W          6.1.121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:427
 kasan_report+0xd4/0x130 mm/kasan/report.c:531
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 sysv_new_inode+0xd8c/0xf04 fs/sysv/ialloc.c:153
 sysv_mkdir+0x44/0x138 fs/sysv/namei.c:121
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
 do_mkdirat+0x220/0x510 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000008e7a6bd2 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x13a62c
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000fa62c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000fa62c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000fa62c180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000fa62c200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000fa62c280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================